I Googled it, and the cost of the device is under $10, and the 2-pack refills are under $5.
 Reading the posts about best time too avoid bugs and the answers, made me think of another use for this item.
 Someone posted about using the "facilities" when the bugs are bad. We've all had THAT experience, you drop trousers, and the little bastards wait till your exposed and vulnerable and they have their way with you ;D
I figure the Clip-on might give you enough level of protection, that you could do you business in peace ;)