i got the cardsfrom ebay... i acutally jumped the gun a lil ... seen them first thought it was a steal an started biddin... then i looked around an seen all the others sizes at low prices.... ahh well i think the 128 will work for my setupim 10 minutes away from my camera... so makin 1 trip a week isnt nothing if the battries i got last that long.. i know i know.. get the 12volt setup...... maybe adventually........