Also, keep an eye out at Wal-Mart for things on clearance. About a year ago they were getting rid of the natural vit. E human capsules in a certain IU size (can't remember what it was), for $5 a bottle. I bought every single one they had, then went back a couple days later when they'd restocked the shelves and bought all those too! Must've thought I was either crazy or planning something nefarious. Only thing that sucks is my oldest broodie refuses to eat the gelcaps, so I always have to have an alternate form on hand just for Her Highness.
I also use vitacost.com. Fast shipping and my mare gobbles up her gelcap. I had used elevate powder in the past, and I think I've gotten better results from the gelcap. Maybe the liquid elevate is better, but, I think it's more expensive.
I also order from Vitacost. I used to get it from Swanson, which was the best price I could find, but they have not had it available for months now. My horses all eat the gelcaps fine, so easy and cheap.