727 pricing help

I know theres a lot of factors in pricing anything which comes down to application, and quality.

For a rough idea of what im looking to spend on a 727, bay area price wise, what could a core or rebuilt 727 cost me? Found one for 750 and a new one would cost around 1600 if ordered. Suggestions on what a workable core would cost or how much a rebuilt should cost without figuring labor and profit? A junkyards transmission, if I can find one, is about 200/300. If I can find one and slap on a rebuild for much cheaper, then I might want to go that route.
Thank you in advance