We have inspected your 3DS XL units, and the DSi. There are problems with the power port electronics inside of each of the 3DS systems. We did not find any issue with the DSi unit other than it needs the AC adapter replacement to charge it normally. This delicate repair requires the disassembly of the console in addition to component level repairs to the 3D main boards to repair and replace the power ports in the units. In addition our technician noted that the buttons require cleaning and dust was found on the motherboard and screen. The dust need to be thoroughly cleaned out or you run the risk of shorting a component on the board. We have also found both AC adapters to be damaged and do not power up, so they will both need to be replaced as well. We have also added the 4GB SD cards to the order as per your request. The total cost for replacing the 3DSXL power parts, 2 SD cards, and 2 new AC adapters, to complete the repairs, cleaning the unit, with in store pickup is $66 for repair + $9 replacement AC adapter, +$6 SD card for EACH SYSTEM. That includes a 90 day warranty on the replacement parts and repair. As an alternative we can simply return back your unit to you and the inspection and diagnostics fee is $26.95.