I buy ALL of my Riteks from a seller on ebay (as Bighap said).....
Actually, I'm working on my 4th 100 pack from him.....
He does charge more than most......
BUT.... I KNOW I'm getting the real thing and I LOVE his service.....
I have never had a single problem with him.....
AND.... I trust him... (That alone is worth the extra money to me)