There is the Whitewater Tube Company. They have some boating gear, depending on what you're needing.
I'm not sure if they still do this, but when nick ran it, he could get anything from CKS in a couple days if you don't need it on the spot.
REI has some stuff also.
Boulder Sport Recycler out north sometime has a few items boating related.
Neptune Mountaineering has lots of dry bags and camping gear. The new owners distribute Sea to Summit, so their entire line up is on display there. Some of the STS stuff is no raft worthy. There super light stuff is not even kayak worthy.
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