Hi Mike,
Welcome to ALR. Lancaster guns are covered in RCA Vol. 1 and York County guns are in Vol. 2.
I understand about the tight budget. If I may suggest, check your local public library to see if they have the RCA books. If not, ask them about the Inter-Library Loan program. They will borrow the books for you, for free, or at worst a small fee, and you can decide which one to get.
As expensive as books are, I nearly always preview books I'm thinking of buying, just to be sure before I spend the money.
-Ron