Depending on brand (which i prefer Freud) i would look at Amazon or Ebay.:T
Rockler is a great woodworkers supply shop, that's another place to keep in mind. By searching the web it's amazing the amount of dealers there are and the deals you can get so shop around abit and see if you find what your looking for and for at the best price.:TI have never built a sub, but I do a lot of wood working and I buy most of my stuff at Rockler. They have deals from time to time and you can get items at quite a discount if you watch for these deals.
How do you find the quality of these bits ,do they last long ??I really like MLCS (http://www.mlcswoodworking.com/).
Good prices, free shipping, good return policy.
Glad I could do something helpful todayI checked out the site you linked Jim and it is a wood workers dream site. They have a Router lift that a want somethin feirce.
As far as the bearings go on your bits i would assume dust was sucked into them causing them to drag and overheat.
I really like MLCS (http://www.mlcswoodworking.com/).
Good prices, free shipping, good return policy.