I blew a thousand dollars (Canadian) to upgrade my new Mac Plus to 4 megabytes and the sales guy asked --slightly tongue in cheek but only slightly-- if I was doing CAD for NASA.
I extended memory in my Mac Plus to 4MB for about $5 a few months ago. Nowadays, when anything marked with the "retrocomputing" label can be ridiculously expensive, this kind of 30-pin SIMM memory is still considered as obsolete, not classic.
Anyone BTW remember the thick 1MB SIMMs based on DIP chips that was common before DRAM prices declined in 1989?
In what year? The DRAM market changed between 1987, 1988, and 1989, for example.