Motorola RAZR V3xx

does anyone know where I might find a Motorola razr v3x phone i can use as a backup phone with my cingular service. Cingular does not seem to want to sell me one at a reasonable price. I am looking to find one that will work with my cingular service. I presume i can just place the sim i have now into the razr and use it as a backup if need be...... Trying to find one that wont cost an arm and a leg......any help would be appreciated...