Newegg offers the refurbished FreedomPop Freedom Stick U770 4G/3G USB Modem bundled with a 500MB 4G/3G Data Plan for $29.99. Coupon code "EMCAPNR78" cuts the price to $14.99. With free shipping, that's a $5 drop from two days ago (which included 2.5GB of data) and the best price we've seen. (It's a current low by $9.) Deal ends March 30.

Note: A 90-day warranty applies, but it's unclear who backs it.