I bought my solutions at the local hydroponic shop. Got electrode storage solution, TDS calibration solution, EC calibration solution, pH 7.01 calibration solution... It was about the same price as buying online and paying for shipping, but I could walk out the door with it.

Not sure where in TX you are located, but looking very quickly on Google, I found a place called Texas Hydroponics, which is apparently in Dallas.

Texas Hydroponics :: Hydroponics :: Meters & Testing :: Calibration/Storage/Cleaning Solution