Agree with Cholly the Sandisk ones are the ones to go for!
I have used nothing else when I had the A77 and the ones to go for especially if you using the burst modes on your camera are the 95MB Extreme Pro ones?
They around £30 for 16GB as long as you don't go to Jessops where they are slightly more shall we say LOL!
I know currys/PC world had them in for £30? Or if you want to get them online possibly cheaper, but beware of to good to be true prices as they will 99% sure be fakes!