If I recall correctly, I bought my deactivation bar for $95, and a used PORSCHE baby seat for $49 that had the buckle. I then cut off the buckle to pair with the receptor, and sold the used PORSCHE baby seat for $85 (without the buckle). Not sure why anyone would want just the seat, but someone did. So all in all, the mod cost me $59 (this was in 2008 though). Yours still a better value!
