Have you tried speaking with the store owners? According to their website the founders sons run the store and customers are invited to speak with them. You are still within the 6-8 week window described in your original post and I doubt you will be able to cancel the order but you may be able to get a price adjustment, especially if the sales person has a history of stretching the truth. Have a reasonable figure in mind and don't be afraid to ask. The worst that can happen is they say no.

Good luck.