cheaper on ebay. look for valkia hepa air. This model is PU-PO2. Also note this is not a true HEPA filter.
The main differences between HEPA-type and True HEPA filter are the filtration efficiency . In general, HEPA-type filter has a 99% efficiency rate of capturing particles as small as 2 microns. True HEPA filters up the game with a better 99.97% efficiency rate at particles as small as 0.3 microns. this items specs show a 2.5 micron capture size which is over 8 times the size of .3 particles.
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4 filters for $29 on Mothership