@adonay
I disagree, old car parts can fail much faster than old electronics, because of strain. Many people want old Amiga parts and are willing to pay for them more and more, so the prices can only go up, especialy because NO NEW parts are being made and old ones are slowly dying.
But if you look hard enough, I think that you can still find a great deal. If you cannot find anything in your town, look in Germany or UK, many Amigas were sold there. Post WTB in some forums that are not directly Amiga related (yeah, spam a little) because many ppl havent used their PIV 060 A4K in many many years and don't know how much they are worth. Also, you should try some TV stations, they used a lot of expanded Amigas.