not exactly sure where the price a high quality 'stock' used ATR-102 starts, my guess is the $15k-$25k range. to know it’s high quality you need a reliable source.
for reference a nice Studer A-820 is likely in the $30k-$60k range for comparison purposes. i know since i just sold 3 of them.
a hot rodded ATR-102 likely is ’more’. but it is really the way to go long term. and justifies your investment in great tapes. here is a link to a post with some ’AK’ contact info. there is no website. if the link does not work it’s post #39 on that WBF thread.