I don't think that you are foolish, but nor am I...go with them!
I don't believe the price that you are telling me or they are telling you.
To: Dealer, Crummy
I'm just shopping for the best price--it would be foolish of me not to. I found the exact same car including alarm and mats for $XXX. If you can't beat that, then I will go with them. Thanks for your help.
From: Dealer, Crummy
I would not waste your time...I won't do $XXX including alarm and mats on our car. If you are not buying the car then I can't help you anyhow.
I thought that you were happy with our product, service and our price.