I have good luck with Align - worth trying!
Yes, about $1 a day but well worth it to me. I have not priced any other. I got samples from my doctor and liked it so well I just buy it. I get it on ebay - some good deals there. Just try it first and if it works for you - check buying in bulk at ebay. I got enough for 4 months at once a lot cheaper. By the way, I tried Primal Defense and could not take it - caused too much gas which never went away.