If you are visiting a local retailer and buying a lot of stuff, make sure the person working that section of the store actually camps!
We had 2 shopping carts full at CW a year ago and consulted with the guy ringing it up as we went. Now a year later I wish he was a bit more honest about a few items, but that's maybe $50 out of a much larger bill.
And it never hurts to ask if they have any coupons or special deals they can make since you're planning to buy a lot of stuff.
I've used Amazon a lot after that initial trip.