Here's something to think about: There is a lot of interest in used Sony A-mount equipment.
Henry's (in Canada) had three Sony A-Mount cameras up for auction. In general, Henry's auctions are fairly top quality used equipment. Shipping costs are very low and they have a 30 day return warranty (buyer pays shipping). Their auctions are limited to the Canada-US region. They are a highly rated company.
For Jan 15 - 16, Henry's had three early model A-Mount cameras from 10MP - 24MP. The models were A77, A700 and A200. Because of Henry's reputation, and the grouping of these products over the two days, I think they got pretty "top end" prices, so you can think of these as indicative of the highest prices such cameras can receive in these situations.
If you check the bidding histories, it is clear that the bidding was very active, particularly in the last half hour for each. I think that this is an indication that there is still interest in A-mount.
"SONY ALPHA A77 24MP D-SLR CAMERA BODY/SLT-A77V/USED/$1"
SONY ALPHA A77 24MP D-SLR CAMERA BODY/SLT-A77V/USED/$1 | eBay
Ended Jan 15, 2018 , 20:11
Price: $289.00 US + $13.74 US shipping = $302.74 US
"SONY ALPHA A700 12.2MP DIGITAL SLR CAMERA BODY/USED/$1"
SONY ALPHA A700 12.2MP DIGITAL SLR CAMERA BODY/USED/$1 | eBay
Ended Jan 16, 2018 , 20:15
Price $160.49 US + $11.70 US shipping = $172.19 US
"SONY ALPHA A200 10.2MP DIGITAL SLR CAMERA BODY/USED/$1"
SONY ALPHA A200 10.2MP DIGITAL SLR CAMERA BODY/USED/$1 | eBay
Ended Jan 16, 2018 , 20:30
Price $130.00 US + $11.70 US Shipping = $141.70 US