Depends on the size but usually around 2-7 bucks
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Less than $10 . I have painted a few with two spray cans, one being a good primer.
PVA is a better primer for new drywall. Do you need it, not really. Any good latex primer will do the job just as well. I guess it really just depends on what you expect your primer to do. Cheap primers will seal the drywall, but not much more. I find bonding primers and pva primers will provide a much more solid platform for topcoats. They may cost more and be a little overkill, but they will provide you with layer of primer that will allow your topcoat to dry in even. You can also dry a high build primer, which is the product I prefer to use. They give you a great platform to work from, and since they are usually about 3 mils thicker that standard primer, they fill in a lost of voids in your wall. If you go with this kind of primer, it is best to spray it. You really can't achieve the mil build up you need from a brush and roller application. If you use the roller application, and are worried about really sealing the wall and filling voids, I would recommend two coats of primer.
Etch primer
Small pistol small pistol primer
reverse primer, going from stop to start codone