Purchase the 4x 100$ gamestop egift cards on ebay for 360$ i.e. 90$ each. Then use that 400$ gift cards for purchasing this bundle. So you will get it for 389$ and still you will save 11$ gift card credit. So effective MSRP is (360$ gift card price - 11 gift card balance) 349$+ taxes on 389$.
Gamestop Gift card listing link on ebay: http://www.ebay.com/itm/253115042701
Nintendo Switch Bundle details:
Ships by 9/8/17 The Nintendo Switch Console with Gray Joy-Con Mario Kart Bundle includes: The Nintendo Switch Console with Gray Joy-Con, Mario Kart 8 Deluxe, Nintendo Switch Racing Wheel 2 Pack, and Nintendo Switch Premium Console Case - Mario Edition. This bundle cannot ship to a PO Box or APO/FPO address. Not applicable for return on any products that were sold as part of a bundle, unless the bundle is returned complete and in sealed new condition.