First hit was http://www.ebay.com/itm/Original-LCD-Display-Repair-For-Samsung-Galaxy-J7-4G-J700-J700T-J700P-J700K-/111752174482 and that was 19 dollars.
If that's too much then no, I don't know of any cheaper.
I have been looking cor. Replacement screen cor my broken one. I have seen lot of other models. The few samsung j700t that i have found are almost the cost of the phone itself. Anyone know if it is compatable with another j7 model, and where to buy fairly inexpensive?