Dan Chung of newsshooter.com reviews the Airbox, an inflatable softbox:
Brilliantly simple, these softboxes are designed with the fast-moving shooter in mind. It takes literally seconds to inflate and attach an Airbox to suitable LED light. The result is a softer light that will flatter your subjects. I’ve been using their Macro softbox on my Cineroid LM400 LED for a few months and it makes a lovely, highly portable battery-powered key light for interviews.
Here’s what it looks like:
Supposedly it’ll cost less than $100. Read the entire overview here.