hi,
i found my cabinets on craigs list, but i have used ebay as well. you can search locally on both sites. i get a local "shoppers guide" that lists furniture, etc by personal sellers. and, my local lumber yard usually has specials on their sample displays. you can ask if/when they're planning to replace them and check regularly! (i missed an entire oak kitchen for $300. b/c i forgot my cc!) as you can imagine, they go FAST. it may take some time, but it's well worth it.
well, back to my projects! good luck! ...and good holidays!!