Hi mr311998,
Although this supplier isn’t in the directory, they should be safe to deal with. They're well-established and they also accept safe payment methods such as PayPal and major credit cards. Please note however that we cannot guarantee the safety of any suppliers outside SaleHoo so please make sure you only pay with a safe payment method and ask a lot of questions before proceeding.
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Now the suppliers below do offer wholesale options but I didn't see any folding kayaks on their sites, just the regular ones. You can check with them though if you like.
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I'll still try to look, will let you know if I find any more.