allow me to suggest
http://www.pilgrimdiscount.com ... it's a local store here in portland (they ship books too) that has an excellent selection of used books... the only christian bookstore in portland that i'm aware of that has a THEOLOGY section (with tons of reformed resources) and an OLD PATHS section featuring the puritans, augustine, calvin, luther, machen, spurgeon, ryle, etc... i seriously spend so much money there and i still can't afford to get everything i want... alas, they do indeed peddle religious knick-knacks and christian trinkets (yuck), but i guess they have to make some money somehow...
[Edited on 6-16-2006 by dust_and_ashes]