These days ebay is really a last ditch place to find Commodore stuff. I have better luck at yard sales, and flea markets. Old friends are the best help.
I am down to two Amigas these days; an 030 fired A2000 and a stock A1000 (with 2.5Mb). They are used every day, not just stuck on a shelf.
Prices are going to go up. Markets do that. We just have to balance everything (and ignore the stuff that is just too expensive)
I find it interesting we can buy a brand new SD/FF for way less than the old options (I am refering to the Indivision VGA adapter).