As long as your prescription is current they should just be able to fit you in another pair of frames with your current lenses. Most places don't need a prescription to change frames in my experience, but I have never used Wal Mart though. Hope this is some help.
If you bought the frame from there , they might have the replacement, but that's something changing all the time. They many other styles from several brands , though. No, you don't need a prescription for the frame.
If you have the lenses they maybe able to help
You don't, as long as your lens fit the frames they have.
They carry wide variety of frames...no scrip needed
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