Try online marine classifieds. Also, the free magazines at West Marine may have some ads for a similar outfit for sale. If you're around a marina, check the for sale boards. There's usually a card for an inflatable of some type for sale tacked to the boards.
I would check with Ballard Inflatables also.
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"I didn't care what she didn't 'low--I would boogie-woogie anyhow" John Lee Hooker