I have several Pre 3 main boards, complete. I'm in USA and will ship free inside continental USA. Some are UK Pre 3 main boards Some are AT&T Pre 3 main boards, some unlocked, some locked.
Unfortunately I do not know which boards are which, so I'm willing to get rid of them for $20 ea - as is - no warranty, no guarantee they work, - Like I said, as-is, although I know most of them do work, but there could be one in there that doesnt power up. Its a crap shoot I guess,
PM Me if you're willing to roll the dice and want one or all of these for $20 ea knowing they re as is and may or may not work.
EDIT: These main boards all include the radio boards. The radio board with IMEI and emmc memory is what determines whether the device is a UK 8 GB or an AT&T 16 GB.. Therefore, If you know you need only the main board and that your radio board is OK, then any of these might work for you not knowing which ones are UK and which ones are AT&T.