I am currently paying $1.90 each for silver dimes.
Here are the catefories:
Roosevelt Dimes (1946-64 circulated to UNC, 1992-S to date silver proofs)
Mercury Dimes (1916-45, mostly 1934 and after, common teens and 20s are ok)
I will pay more for any key dates found in the silver.
Low-grade Barber dimes, common dates (preferably AG and below, these make a good marketer for my rolls of silver dimes).