Check out the new update version of the DonJoy Stabilzing Ankle Brace. It's pretty much the same thing as the ASO, but newer materials and less stiching on the inside so there are no seams to rub. I have tried both and this new one is really nice.
I last got mine at DonJoy's website which...
Other Ankle Brace options
I really like these two Ankle Braces best.
For every day use I use the Aircast A60 (same one Murray uses):
http://www.betterbraces.com/ViewProducts/AircastA60AnkleSupport/168.aspx
For days when I want the extra stability and you might like the Velocity Ankle...
Andy Murray's Ankle Brace
I've tried the Ankle Brace that Andy Murray is using and really is the best thing I've found for tennis. Check out the Aircast A60 as a real nice option.
I googled it and found http://www.betterbraces.com/ViewProducts/AircastA60AnkleSupport/168.aspx