The internet is a wonderful thing; I don't limit myself just to vendors that sell only at retail prices. Searchtempest, Craigslist, eBay, FABO and other Mopar related sites classified sections often have people selling new parts they bought for an unfinished project, for about half of retail price.
On top of all those, I cruise swap meets as well. I personally don't care who provides me the part, as long as the price and quality meets my needs. I do sacrifice time on numerous occasions for savings though.