Merry-Go via Amazon offers Prime members the Iselector 1,200-volt Indoor Electric Bug Zapper for $20.99. Coupon code "4NP6EFWK" cuts it to $13.64. With free shipping, that's a buck under last week's mention and the lowest price we've seen. (It's the best deal now by $11.) It's compatible with 110-volt plugs only. Deal ends May 22.