I could see someone holding it until the payments are complete. Good idea to lock in a price but I’m not sure the 9 week stretch would be appealing to most. I’d also save up just in case you don’t find someone. At 9 weeks you would have it either way, or pay a fraction more if it climbs.
I haven’t used it myself but would it be worth checking out PayPal credit if you want to pay for it in installments? I think it’s 0% interest for the first four months, but I would read up on it fully before going that route. Just a thought!