Where to buy 2-4 large (650w+) solar panels

I'm hoping to upgrade my camper van with 2 large panels on drawer slides but I've hit a dead end in my search for the panels. Greentech in Houston doesn't carry them. Only leads I've gotten are on facebook market place in Oklahoma and Knoxville TN.

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Unless I want to buy 24+ panels I'm SOL it seems.

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Any suggestions?