A Tercel is a front-wheel-drive car and the differential is located inside the same case as the transmission. To replace the differential, the technician has to open the transmission... and that's tricky.
To answer your question, a new differential (if one is still available) will cost $1,000 to $1,500. A used differential will probably be $100 to $300.
I recommend a used transmission, which will cost around $300-500. Replace the transmission as a unit that includes the differential, and that will be cheapest and fastest, and have the least labor costs.
Good luck!
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