Save the money and do your own. It's not that hard. Time consuming, but not hard at all. A couple hours and you've done a set of doubles. You can get the products you need from Global. Cleaner, rust inhibitor, distilled water and a couple full tanks of air for the quick dry and you're done.
Viton o-rings are cheap if you know where to get them.
Viton o-rings are cheap if you know where to get them.