Yeah, I increased my dose to one capsule twice daily... and I'll stick to that until things get a little loose (if they ever do!). I buy the Sam's Club ones... there are, like, a jillion of them for 8 bucks or so. :)
They're similar. Costco is better for fresh stuff and prepared foods, I think. It felt a little "higher end" than Sam's the couple of times I've been to one. Sam's Club is owned by Walmart.