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Best Buy offers the Rocketfish Power Shell with Rechargeable Backup Battery for Nintendo DSi, model no. RF-GDS1128, for $1.99 with free shipping. That's $18 off and tied with a Cyber Monday mention as the lowest total price we could find. Sales tax is added where applicable. It powers the DSi for up to 12 hours and comes with a USB charge cable and screwdriver.
WMI GDS-100A-RF Rigid Plate Shock-Absorbing Caster,Black is also available at these stores