If you actually need to get new parts you are almost certainly SOL.
I had an old macbook that had it;s power port pulled out a few times. I managed to resolder it twice, but eventually I also lost the part and was completely unable to find a new one as it was apple only and they didn't sell them.
It might be possible through a tiring internet search, to find out the original part numbers for the original parts and the OEM manufacturers for them. IF you do that you MIGHT be able to get them to sell you one (instead of say 1000, which is probably how they normally do buisness) UNLESS the part is proprietary in which case you are SOL again.
If you must repair this machine, your best bet is a new motherboard, or, if you're lucky a daughterboard. The price is probably higher than an equivalent whole machine though.
You are apparently not the only one with this problem. I checked on ebay, and there are numerous parted out machines, but no motherboards. Looks like you got a flat out bad design here.
I suggest buying a new laptop. preferably one without a crap power connector.
if you're really desperate there is one fairly ugly hack you can try. It is something they did on old powermacs: Completely abandon your current connector system.
On the motherboard there will be either two or 3 power traces that connect to where the connector used to be. You can solder wires to those traces, strip back the leads on your power supply, and connect them directly. This makes a very fragile connection, which can be partially alleviated by leaving a small loop of wire inside the machine which you then fill with silicone caulk. this is a one time only fix. You now have a corded computer, and if you trip over the power cable again you are just flat out done. The hack makes further repair impossible. You'll have to salvage the hard drive and throw the thing away.