I have friends abroad visiting the Golden State.

Any recommendations for a mifi rental service in the USA?

I'm trying to beat the hotel price of $15 per day.

So far, my searches have all turned up results that are significantly more expensive - frequently with limits (what a lose lose combination!)

This seems to be the leading contender (http://www.jojotalk.com/wifibox.aspx) but the site just seems a bit sketchy.