I want to do/purchase several thousand (non-repeating) PMP 5^th edition practice exam questions with explanation of answers.

If necessary, can pay up to (the equivalent of) 1 cent for each question with explanation answer. Ideally I want no time limits or up to 6 months, as I hope to use this as a learning study tool without rushing or running into repeating questions; therefore mock exam that cycle over X set of random questions from a bank are undesirable.