Wow, the prices have really comes down, in looking at Amazon, you can get an SDXC 64GB UHS-1 R40 (is that a mouthful, basically means 40Mbps read and SDXC breaks the 32GB barrier for SDHC) from Sony for $37 or $42 now. The Sandisk is about $66 and probably better build quality and the Transcend splits the difference, but I tried the Sony and it seems to be working fine.
You can also get it from B&H for $38