No one best place - I've bought domains on EBay, NamePros.com, Afternic Bazaar, TDNam and registered them myself.
contact iboy, a member of DP. he has a lot of old domain names just found his site ( i think ) http://www.yourmaindomain.com/olddomains.asp
thanks for all the suggestions. on many of these sites it is hard to find old domains for under $100. i found that you can get a semi-old domain (about 3 years) on ebay for $5-$10. they are usually pretty crappy and are worth that though.
Unless the topic starter means buy old domains which are someone else's property, the best deal is finding old expired domains and grab them for the regular registration fee. I have near 10 old domains registered that way.
Great tip ..the URl provided... there are some real winners in that list .. makes me want to sell a few of my own ..lol
Yeah, I guess it all depends on what you're going for. I just wanted some old domains because google seems to give preference to old domains (for whatever reason). But i've bought tons of expired domains for the traffic.
Have you tried domaintools to see what is expiring? You can pick up the less popular but older ones on snapnames for $xx or $xxx
its very tough to find old domains on internet, why don't you go for sedo. Information about domain age might be available at description .