There are tons of very good pipes out there for under 100.00 with estate pipes being in my opinion the best bang for the buck. I would look at some of the on line estate dealers who sell quality pipes. If you want to delve into ebay, it would behoove you to really do your homework, there are great deals but you really need to know what things are worth. Some good names to look for are Radice, Mastro de Paja, Caminetto, Ascorti, Upshall, Ser Jacobo, Don Carlos, L'Anatra, Ardor, Lane Era Charatans, Astley's, if you can buy pristine pipes from these makers for under 100.00 in most cases you will be getting a pretty good deal and in some cases great deals. When dealing with the older British names like GBD, Comoy, Sasenie, Barling, a ton of research is needed to know what you are getting. In general terms, the Italian makers make their pipes with wide open draws( which I prefer) where as English makers use a smaller opening. That is just a matter of preference. If you can find Savinelli Autograph's for under a hundred in great shape, jump on them.
Here are a few examples from a couple of well known, well respected on line estate dealers.
http://briarblues.com/mdp07.htm
http://briarblues.com/rua69.htm
http://www.mkelaw-pipes.com/html/pipee1830.html
http://www.mkelaw-pipes.com/html/pipee3074.html
The Tsuges from SP are great deals, but most are pretty small.