I've got one of those replacement backs for the steam controller that has room for the USB dongle, along with an extra dongle. Plus a controller skin from the Steam Dev Days.
No games in particular that I'm looking for, so send a list or if you have credit for Steam or GOG I'd be interested in that too.
No games in particular that I'm looking for, so send a list or if you have credit for Steam or GOG I'd be interested in that too.