VA stands for volt-amps.
Clicking one of the "more info" links on Tiger Direct I got this:
When purchasing a UPS system, you need to know how much capacity you need. This capacity is measured in volt-amps. To determine the number of volt-amps that you need, take the number of amps multiplied by 120. If the measurement is in watts, multiply by 1.82. For example, if your monitor uses 2 amps (2 x 120 = 240) and your computer uses 100 watts (100 x 1.82 = 182) the total volt-amps needed would be 407 (240 + 182 = 422).