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Cost of a 128KB computer with floppies in 1985
(sopuli.xyz)
This is a most excellent place for technology news and articles.
We had an Apple II+, IIe and //c. I would inherit each one when my family upgraded. They were around $1300 each I think. The //c might have been more because it was "portable" (you could put it in a suitcase with a 10-pound battery and a weird tiny horizontal screen that wouldn't work with most software).
My grandparents had a C-64 which they never used. It basically became mine. I think it was $600.
Owned a //c that was all mine, a birthday gift IIRC. I remember that it had a composite output so you could plug it into a TV to play games on a bigger screen that actually had colour. Loved that thing, including the monochrome (green) monitor that neatly sat on top of it. I would spend hours typing in programs from magazines.