Basic, basic, basic. The lady at the gift shop in Mount Rushmore suggested that these folks might…read morehave postcard stamps and so I made a stop here for stamps, snacks and a drink. They had stamps, but they'd only sell me one. Strange. But they had candy bars and they had cold water. So there was that.

Small town gas station and c store. A very basic gas station with a couple pumps, and inside you…read morewill find the most basic of basics. Ice, cold beer (plain Jane domestic), snacks and that is about it. Sparse and dated, but if you are in Keystone, this is about it, so you might as well stop and fill up.

Cute store! Looks clean too…read more The gas pumps looks tidy and had enough space for everyone to like in for a fill up.

Don't get ripped off! The price on the sign is the cash price and is 50 cents LOWER than credit…read morecard price. IMHO this is false advertising. Note the station employee said 'everyone does it.'

Best Breakfast. Don't be overwhelmed by the 10.oz pancakes they are great. Fast Friendly Serviceread more

We made sure to stop here before our tank was on empty!…read more Big D Oil in Custer, South Dakota sells Sinclair gasoline. Gas price was fair for the area, and really cheap compared to the prices we are used to in California. Convenience store was decent size. Good stop to make in Custer, SD.

This is my second favorite gas station in town. Great gas and customer service. Better stop before…read moreyou are on empty!

Common Cents is the 7-11 of South Dakota…read more No, that's not a joke. They've got the same roller dogs, same flavored drinks... same everything. Plus gas, which not all the 7-11's have. Food quality's the same, too. I.e., it's good for convenience store food, but it is still convenience store food. I wonder if anyone's told 7-11 about this place?

Great service and the best gas prices in the hills by 5-10 cents a gallon. What more do you need…read moreyou know?

Great store, friendly sevice!…read more 24 hour convenience on a major street in Rapid City, SD.

I loved this little store...both the employees and manager were fantastic! The manager Michelle is…read moreso good to her customers! I wish all bosses treated their employees with respect the way she does!

They pretty much have anything you want here. Gas, Diesel pumps for large rigs (RVs), large…read moreconvenience store inside with drinks, food, hot food, clean restrooms, small casino and sports bar as well. Burger was good, large party. Patty melt too greasy and came with yellow cheese. ? Fuel prices good too.

Great place to stop for fuel while exploring South Dakota. Employees Alisa and Lacey…read morewere so friendly and helped us come up with a good plan to see Badlands National Park. They even gave us a map. The restrooms are very clean as well. In addition to fuel, there is also a small convenience store and casino

It's your typical neighborhood small convenience store with gas available. I stopped by to purchase…read moresome lottery ticket scratchers and it was busy inside with a constant flow of customers. The service was quick and the cashier was friendly.

Cheaper gas then in Keystone which seems weird? Inside of store has a little of everything for…read morefood, drinks, & gifts. Well stocked which I wasn't expecting, & variety. Inside to right is ton-o-tourist info which I was needing since we really had just planned our trip on a whim. Little tricky pulling in here with our huge RV fyi. Gas in 2015 fall was 2.39 here, and Keystone was 2.99 for example.

Solid neighborhood grocery store for everyday basics -- clean, organized, and convenient. Prices…read moreare reasonable and staff is friendly. My only real issue is the lack of organic options. No organic produce, very limited natural or health-focused products. For a quick run it does the job, but health-conscious shoppers will likely leave wanting more.​​​​​​​​​​​​​​​​

Are you in the market for incredibly overpriced food that's a little stale, wilted or rotten…read morebecause no one will pay those prices until they are stuck and have to? Then this is your place. Super upset. This is the only grocery within fifty miles that isn't a dollar general. If you're not poor enough for food stamps or rich enough not to care, do yourself a favor and go to Walmart

My family stopped here for snacks and a bathroom break during our vacation. It's a nice convenience…read morestore with friendly, kind employees. I'm attaching a photo I took of a flier that was in one of the bathroom stalls. I will always shop at stores that try to help human trafficking victims. The next time I'm in Custer, this Conoco station will be where I buy fuel and snacks. Thank you for being good people!

I stopped here for gas, as they discount it if you pay with cash. I had just over half a tank when…read moreI pulled in, yet the total full amount turned out to be more than half of my tank size. I couldn't find a weights and measures sticker, but not sure what the laws are here. Anyway, I'm a little skeptical about the amount pumped vs the amount I was charged for. The attendant at the counter was friendly.