FDC has a wholesale program (see Link hidden: Login to view.) I have had pretty good luck, when it comes to craft and gift suppliers, just looking for the stuff I want at Michael's et al. and then flipping the item over and noting the info on it. Not all items will have the manufacturer/distributor name on them, but many will, and it doesn't take too many to get a call list going. Get a nice rapport going with a rep at one company, and he/she will generally be happy to recommend other companies for stuff that they don't offer but for which you are looking.
Frank