Outdoor Emporium in Seattle has both the extendable and solid wood. The extendables are really nice. They are in stock too. They have a short extendable, That extends from 3 or 4' to about 6' for storage or the 5' or 6' (can't remember) that extends longer for those tall boats.
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Join the Puget Sound Anglers Sno-King Chapter. Meets second Thursday of every month at the SCS Center, 220 Railroad Ave. Edmonds, WA 98020 at 6:30pm Two buildings south of the Edmonds Ferry on the beach.