First off, those are awesome seats! I hadn't heard (or seen) those before.
Secondly, with companies like this, they will give you better prices if you call them up and ask / negotiate with them. That's not a statement either, it's a fact. Most companies have a set MSRP, and their resellers are not allowed to list their products for under MSRP, so you likely won't find the seats themselves cheaper anywhere else. Finding shipping cheaper is possible though, I'm sure. Those things likely have to go via freight shipping due to size, so my guess is shipping won't be super cheap no matter what.
In all honesty though, just call them. If you call them up, they will negotiate price. Any good business will do that, because they have margins built-in that allow them to be able to do this.