Reducing price paid at AD

[WatchinMD]

It seems to me that if your local AD is happy to send you on your way with a shiny new watch on your wrist after swiping your card for full MSRP, then they should be equally happy knocking off the 3-4% credit card fee if you pay in cash/wire, etc. Has anybody had any experience with this?

Also, has anybody been able to buy from an out of state AD and have the watch shipped to you home, avoiding sales tax. Alternatively could one avoid state sales tax having it shipped to a friend in another state? My state's sales tax is 6% so it is not insignificant.