Cheapest Adequan for horses?

I just paid 42.95 each for 7 of the one dose bottles from valleyvet.com. Their delivery is great, I'm just waiting on the vet to call in the renewal subscription. I am trying to find out information of Pentosan, if you use Adequan, do you have any information on Pentosan? Some people are calling it better and cheaper, but where I looked it was the same price.

Smartpak is usually the cheapest if you buy the big vial.

http://www.smartpakequine.com/adequan-im-647p.aspx...

It works out to about $38 per shot and 10 to a vial.

ETA:

They are very dependable too and when my delivery was lost they offered to replace it no charge without any hesitation.