I don't personally use them but came across this today $3 .com's and .net's from crazydomains I thought it might have been worth the share.. They seem to also give same price on bulk orders too.
I see they have free transfers going OUT.. anybody know if any of the major registrar's allow free transfers in? +rep to Cyvex
I haven't found any yet DK, I'm going to test the water today and see what I find, I'll report back. But it does say on the main page you can get 50+ Domains so it doesn't appear to be limited to a small amount of numbers unless 50 is tops.