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Give Klems in Spencer a call.I haven't been there in a couple of weeks, but last time I was there, they had some. Also, they are showing them available on their website.
Depending on what size sled you want, Home depot has cement mixing plastic sleds. They are great, even include a molded in ruler on the side. Only cost $10 cannot beat that. They are the same length at the jet sled jr and a bit wider. good luck.