Your Prilosec price is too high. It's about $26 for 42 tablets no matter where you shop.
Prevacid is probably a little underpriced because it only recently went OTC.
I know this because I took those drugs for 11 years. Six months ago I stopped them when I went on leptin reset, and haven't needed it since. We've had a couple Success Stories about people no longer needing the PPI drugs. When I told my doctor that I went paleo/primal and no longer needed the drugs, she -- bless her heart -- reacted with an open mind and said "you know, I've heard the same thing from people who went gluten free. hmmmmm.."
Doctors almost never do an actual GERD test for the function of that valve. You tell them your symptoms and they diagnose on symptoms alone. Sometimes they even assume you have an ulcer and prescribe heavy-duty antibiotics like a PrevPack. There's a test for the valve, but it involves putting a tube down your throat (icky), and the test is more expensive than the drugs. So now there are millions of people walking around with a wrong diagnosis.
5'0" female, 45 years old. Started Primal October 31, 2011, at a skinny fat 111.5 lbs. Low weight: 99.5 lb on a fast. Gained back to 115(!) on SAD chocolate, potato chips, and stress. Currently 111.