I recently picked up an Atari 2600 (Darth Vader) with a broken controller port. One of the pins coming out the back of the port had snapped, and although you couldn't see it visually, a quick continuity check with a multimeter confirmed it.
The only source for this part I could find mentioned on these forums was Best Electronics, but I've found another source that I wanted to share.
The part I discovered is 5745001-3 by TE Connectivity, which can be purchased on Digikey and Mouser. I wasn't quite sure before I ordered it, but I soldered it in and it's a perfect fit. Digikey says the part is active, but the unit price is fairly high ($16 CAD, compared to around $2 for any common D-Sub connector), so I'm not sure if they're still being manufactured or what the deal is. Ordering from Digikey made way more sense for me in Canada than ordering from Best Electronics because the shipping is super cheap, overnight, and never has an issue with customs.
Anyways, just throwing this out there in case someone else is looking for a replacement part!