The Gadgeteer has a review of the Cyclops AP280 USB Mini Ionizer / Air Purifier.
"For $20, a little bit less than the cost of a larger sized scented candle, the Cyclops Mini Ionizer is not a wallet-buster. It runs 24/7 in the background and might actually be accomplishing some good. The jury is still out on "particle fallout" - but I will update this review should I decide that my desk's dust accumulation is heavier than normal."
Read the Full Review.
AudioCubes has the Thanko USB Piezo-lonizer in store for $39.
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