FreedomPop offers its factory-refurbished FreedomSpot MiFi 4082 Wireless Hotspot bundled with a 2GB 4G/3G Data Plan 1-Month Trial for $19.99 with free shipping. That's $10 under our mention from two weeks ago (which had slightly more data) and the lowest total we've seen. (It's $23 under a new unit.) It features a battery life of up to six hours. A 90-day FreedomPop warranty applies.
Note: After the trial ends, you can continue with the 2GB plan for $19.99 per month or switch to a free 500MB month-to-month plan.