This is the place for all your stationary needs. I was looking for heavy/fancy paper and they carry…read morethis. Range of weight and also that matte frosted "wax" paper/envelopes as well (not wax, just looks like it...don't know what it's called). Prices for these fancier papers were fair, as long as you're not looking to buy in bulk, it was reasonable.
If you're looking for adhesive 3M hooks, they have it here, whereas JUMBO carries only the brand Tesa. If you want English bday/novelty cards, they carry a range but it's pricey. The German ones are about 2.90fr and the English ones are about 5.90fr or so.
They also carry party goods eg) balloons, bday candles, etc