[link|http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=40122|Available locally] At that price, I'll have to stop by the local Harbor Freight and give it a try - my wife does not rest until all flies inside the home are dead.
I recently got the Harbor Freight electric fly swatter (takes 2 D batteries, so it should last longer), and tried it out tonight on a male mosquito - who, as soon as he was within range, prompty disappeared in a very satisfying blue spark.