I have this one : http://www.sparkfun.com/commerce/product_info.php?products_id=9231 15$.
The only thing is on Macs you need to plug it into a usb hub (but there is some workaround).
For that price it's a good deal in my opinion. 
I have this one : http://www.sparkfun.com/commerce/product_info.php?products_id=9231 15$.
The only thing is on Macs you need to plug it into a usb hub (but there is some workaround).
For that price it's a good deal in my opinion.