Let me preface this review by saying I run a fashion label and we use M Recht for a range of haberdashery supplies. You can shop here as a retail buyer (ie. purchase in retail quantities rather than wholesale) but it's primarily a wholesale / commercial outlet.
M Recht stocks everything you can possibly think of that is fashion related that isn't actually fabric. Buttons, zips, shoulder pads, bra wire, thread, measuring tapes, toggles, ribbon... you get the idea.
If there's a very specific type of item you're looking for (say, an denim button with a red enamel coating) you're better off going somewhere that specialised in it. If you need something fairly generic though, it's a great place to go. The staff are really helpful and they have product across many price points. We use them for denim zips that 'lock' when they're closed (so your fly doesn't fall down) and 'unlock' when you intentionally undo them.
If you're in the industry and you use a local manufacturer, they deliver daily to most places for about $5. read more