CradlePoint PHS300 Personal WiFi Hotspot for $47.99 shipped.  Here is a screenshot for your reference.  It requires a compatible 3G handset and  features 802.11b/g, tethering to cellular phones or cellular USB modems, charges by USB, built-in lithium ion battery, built-in firewall, and more.  Most places have the personal WiFi hotspot for about $59.