http://www.wade-antenna.com/Contact2.htm You will need to contact Wade re. pricing and availability.
IMO Winegard has a slight edge in build quality vs. the Antennacraft, they are both good products. Winegard also publishs more information regarding the performance of their products.
However, the Antennacraft Y-10713 has a balanced 300 ohm feed point rather than an integral balun. This can be quite helpful when stacking because 450 ohm twin-lead (which can be field built of open wire or factory made) can be used as the impedance matching transformer/harness. The losses can be a few dB better than that of the reversed splitter method.
There may be some difference between the two antennas, but they are very close competitors. A difference of 2 dB would surprise me a bit.