Depends where you are. Mewbourne drilled two wells in center of 18s28e (sec 15,16,17) earlier this year. No production info yet. If those work out then its all probably worth a bit more. If you are under those its worth a bit more. The further south you are, its probably worth a bit more. 18s29e has more development activity (drilling and Mewbourne APDs).
Just for the general area, I’d guess a reasonable price is something like $6-7k/NRA. IMO its likely only BS2 and BS3 formations possible, so it can’t be too high end like (way) further south where there are 6+ landing zones.