Note the marketplace wanted rules
Although not required, "want to buy" (WTB) posts should list a price that you're willing to pay. If you're unsure what an item should cost, please ask in one of the other subforums. It's of no use to anybody to expect quality items without being willing to offer fair market price.
You should put a number of that.
Understand you're asking for high-end pro gear here, with continued market demand/need (from both pros and serious hobbyists, and they're not afraid to spend what's needed for the quality the want/need).
The AG-1980P was $2k+ MSRP, ~$2k street price, and lowest ever street price from a shady NY/NJ dealer (infamous ads in back of photo/video magazines in 90s/00s) was right at $1k in the mid 2000s (EOL of the deck, clearancing their stock). A refurbished AG-1980P deck fetches $500-700 (deter, TGrant, other seller in the marketplace). Places like Southern Advantage still demand $1k+ used, and they seemingly get it. Anything sold for less is a gamble, especially stuff sold on eBay
. Anything for under $250 is guaranteed junk, parts only deck (ie only 10% of original cost).
The TBC-1000 was about $500 new + tax/shipping at B&H
at end of life (10+ years ago), and other DataVideo units were just under $1k. New old stock (NOS) still fetches 100% value, and used is about 70% of it, +/- depending on condition.
If your budget is small, perhaps it's time to look into alternative options for transfer -- though understanding you may take a quality hit, or have to deal with other quirks/nuisances (example: "big bertha" broadcast TBCs).
Anyway, good luck.