The first thing you need to do is find which laptop makers offer the GTX in notebook models. That list won't be very long and in general will be quite high priced. Then you just need to look for coupons, special offers, rebates, etc. Timing is the key here because deals constantly come and go for short periods of time.
That said, I could have ordered my m170 with the GTX for $1849 ($350 option) shipped, no tax, from the Army and Air Force Exchange Service (AAFES) website one month ago. Obviously, AAFES is for qualified shoppers only. That price was only there for about 1 week until the price soared back up to $2400 + $305 for GTX.
Dell does come out with huge coupons like $750 off at times. With Black Friday coming up and holidays right around the corner now is the time to get your list together and start visiting all the "deal" websites.