They are pretty well price controlled, finding a variation in pricing is unlikely, and if it happens I would even be weary about it. The MSRP is pretty fair, I would not get the 18-70 kit, the 16105 kit is only $100 more for a much better lens, or I would get body only and supply your own lens.

One important thing to remember, as *soon* as you get your A700, make sure it is version 4.0 firmware, if not, upgrade it to 4.0... Do you already have lens in the Sony mount?