Practical study material or study material that will help you pas a written exam? As far as the exam goes just study the answers to the test (i think there are about 3000 possible q&a's).
As for the rest of it you could save money looking for an A&P that wants to trade his experience for yours, doccument every task you perform and have him sign the doccument. Try to cover all ATA's and get with a FSDO, I forgot how much experience in years you need to get a fed to sign you off to take the test's. That would be the least painless and least expensive process in my oppinion.