Skimming through the December 20th, 1994 issue of PC Magazine on Google Books I found an ad listing 64MB SIMMs for $2600 each. (Page 302.) It looks like at the time the going rate for 16MB was about $600. 128MB SIMMs may well have not existed yet, or at least may not have been widely available.
We are completely spoiled by how cheap computers are now, even premium machines like Apple's products. 1979, page 15: $3,300 for 32k and two floppy drives, for one of the cheapest if not *the* cheapest turnkey computer system on the planet at the time. Factor in inflation and that's about $10 grand. That'll easily outfit an office with half a dozen computers, a network copier/printer, a server, and all the gubbins to tie them together. These kids today, sheesh...
I'm not sure I follow your math, there. According to a currency table I just googled up in 1995 1700DM was equal to about a thousand bucks, which means they paid about $500 for each 16MB SIMM. 128/16=8. 8*$500=$4000. (Or if you prefer, 128/32=4, 4x$1000... etc.).