PacNWdiver once bubbled...
I'd ask to talk to the floor manager or owner and say just what you said above. Be as sincere as you can and let them know that you WANT to spend your money with them but you can't ignore the prices you find on line (I wouldn't mention LP by name unless asked to prove the pricing).
Don't forget to allow for the cost of shipping, local tax (if any) and the benefit of not having to wait 1 week to 10 days for your computer.
I have found shops willing to work with me on this on-line buying issue. So long as I don't come across with an attitude of "you're trying to rip me off." Most owners, even if you can't agree on a deal, have been at least grateful for the chance to earn my business.
John
Been there done that, they call Leisurepro the "evil empire". They told me that there is no way they can match their prices and if I found a price good as that to get it from them.
Oh well right?