A kit I would say was going for $600 a while ago. I think the market has softened though. If you are putting it up for sale take a lot of pics and start high, you can always lower it.
BTW the barrels I'm thinking of with a premium are the PH marked parker hale barrels or the Australian barrels. The standard Enfield or BSA's are worth $150-200ish. If the threads are cut off the front of any of them you're down to a $100 give or take.
Good wood stocks in your kits are a plus.
Are your group buy kits selling at that price or are you looking at asking? You may want to look at the closed auctions. Those are real prices.
A further reflection on kit prices is that the kit highs of a couple years ago were linked to having some nice l1a1 cut receivers available after a long dry spell.