Have you paid him yet?
... If you can't come up with a solution you can deal with... then contact the seller again and ask if you can back out of the deal.
Then he can contact the next lower bidder and sell it to them instead.
If you haven't paid yet and you don't mind a "bad feedback' on ebay... then you could back out even if he doesn't agree.
Forward Air is the cheapest shipper... but it has to be crated and delivered to the Airport.
This is why when a buyer says "he won't ship" or "won't crate" are jerks... and you shouldn't even bid on the stuff... shipping then, costs waaaaay too much.