I'm hoping those GameStop rumors of a high-incentive trade-in (and allowing data transfer in-store) from OG to XL are true--everything I see about the XL makes me want to upgrade. But I'm worried that it'll be $100+ to upgrade, since 3DS has been sold as low as $140 new during sales. As much as I hate shopping at GS, they're the only ones to make such a trade easy--doing it elsewhere would mean paying up front and having to sell the OG yourself, or at a highly reduced trade-in.
The last deal I did like that was with my white Wii--I believe I had to trade in two controllers and the Wii + all cables to get a black Wii, and add $50. That really wasn't that bad, considering my Wii at the time was having storage issues (had to reformat it to get it to work, which is why I did the trade) and one of the controllers occasionally had accelerometer issues.
Unfortunately the only way they can do something like that with the 3DS is to include game trade-ins. If it's any game, I should go stock up on $5 steel divers at Best buy >.>