As for the guide bearings, there is a company on the big auction site that sells nothing but bearings. (They have bearings that range in price up to $35000. Ouch)
They sell the exact ones used on several models of bandsaw. I just bought a pack of 10, which is enough to do upper and lower guides on most saws, for $14 shipped
I have to fabricate the guides for my old walker- turner saw rather than pay $200+ to replace a broken one.