I think it is time to put your system out to pasture. It has had a long life but is totally outdated now.
If you still insist on repairing that old jalapi, you will probably need to risk eBay.
Searching, I found 2 non-Ti cards.Cheapest is listed for $75.
Of course, buying second hand parts off of eBay is a always a bit risky. Never know how long the parts will stay working, if at all.
Also, keep in mind that it could be another component failing on your system. Issues caused by your PSU, CPU, Mb, RAM or other parts could be misconstrued as an issue with your GPU. As such, I would recommend you save this $75 and put it towards an updated system. If you are on a budget, a decent gaming system can be bare boned for around $300 if you go for the right combos. Any
modern system (even a low end one) will be leaps and bounds above what you have now.