how much is this turbo worth

[ShoreMan]

the stock turbo on dads truck went up and he has it at the house now the seals went bad and thats all thats wrong but we already put a new one on. how much is the turbo worth as it sits (just did heads new turbo and injectors and wouldnt mind a little return). i know it would cost $350 to get the seals redone and he could sell it for a different price but it would be cheaper to a buyer if we sold it as is, any ideas what would be reasonable to sell it for?

edit: it is an 03 turbo