i saw Tula AKSU kits go for as little as $900 (once in the last 7 years gun-broker of all the places) but on average rguns all matching 86 Tula kits without barrel go for $1200-1600 depending on the time and seller.
lately (last 12-15 month) these were on the cheaper side than when Obama was in the office.
last two sales i saw on AKF were $1100 and $1200. Surprisingly one of them went with virgin k-var barrel for that cheap. Part of the reason why so cheap is that there is no immediate threat from current administration to our gun-rights plus ak-builder now has AKSU-barrels. granted those won't work with oversized '86 tula journals but a lot of folks who decide to move these don't know such fine details.
My 86 Tula AKSU build was $1520 for a mint all-matching kit, $260 74U LLC receiver, $220 for oversized journal barrel custom run by AKF member (can't remember name)
I'm in $2k in parts alone. granted if i grabbed a cheaper kit it would be less but at least you get the range of what this day and age AKSU is worth.
this excludes cost of building and re-finishing or tax stamp obviously.
Another source would be to check completed auctions on GB - that might be most accurate value of what people are willing to spend vs actual $$ value of the gun (as sum of parts/labor).
i have to say these are selling cheaper lately than before. if i wanted to get highest sale price i would wait until well after mid-term elections. depending on how things play out there might a fair price bump for these.
as far as yugo shorty - i have no strong knowledge of their market tendencies as i don't do yugo. i do know those are significantly cheaper than Tula AKSUs. like in the realm of half the price cheaper, maybe even more. i'll let someone else speak to those exact values.