Locally, with tax a Shield would be $444.85. After the rebate it would be $369.85 locally. You can order a Shield from Bud's Gun Shop for less than that. With the rebate, online FFL's will draw in those who are on the fence about buying a Shield and will kill the local market.
A LGS here is selling Shield 9's NIB for 390.00 out the door (tax included). I am sure if need be they have a "little" wiggle room even at that price. After Rebate that's 315.00 and if pressed could be lower. Online stores are going to charge taxes and shipping (did see one free shipping) then you will have to pay the FFL transfer fee. Best to check around and know all the charges before you buy online.