I just looked on ebay, and what I saw was a standard L2T for about $21…but this was just a host. There are some for about $40 there, but they have an XM-L drop in included. If you’re seeing something else, please post a link, I’m sure others would be interested too.
The SF drop-in is nice but not driven hard, 2A I believe. If you want full output get one of the custom drop-ins sold over in the “for sale” forum. E1320 is making some really nice drop-ins.