Don't know if this has been posted yet, but here it is. I know the 360 version has been under $20 for some time now but the PS3 version has been pretty stubborn.
http://www.amazon.com/gp/product/B001PKHRUK/ref=olp_product_details?ie=UTF8&me=&seller=
edit: Didn't see it's from a 3rd party...