There are plenty of places you can get aircards from. There are also lots of places that you’d question putting your credit card info at.
That being said, let me tell you a bit about the top 4 places I recommend before you even look at what they have to offer. They are ranked based on quality, customer service and prices.
The top 4 places to get aircards I recommend are:
(1) LetsTalk (*tie)
(1) Wirefly (*tie)
*1. LetsTalk 
With all that going for Wirefly, you’d wonder what LetsTalk has going on for it to be a tie. For starters, they’re registered with the Better Business Bureau(they have a good reputation), Digicert (similar to VeriSign for secure transaction online), Truste for Online Privacy. BizRate, like Wirefly, also gives them good reviews. They’re return policy is also similar to Wirefly. You can return it within 15 days.
Bottom-Line: You’ll get a good deal, you’re info will be secure, and if you don’t like it, you can get your money back from Wirefly or LetsTalk.
*1. Wirefly 
Wirefly is powered by Simplexity, the nation’s leading internet provider of wireless services and phones. They’ve ranked in the top 10 electronics sites on the internet in 2004, 2005, 2006 and 2007 by Hitwise (owned by Experian, the credit people). Also, they have been given a thumbs up by the likes of McAfee (the anti-virus people), VeriSign (they keep your credit card info secure), Truste (Online Privacy) and BizRate (with 50,000 customer ratings since 2005). To top it off, they have a 100% Satisfaction Guarantee.
For more information on aircard service providers, check out our service comparison.