Blown Freeze Plug

I've got the car listed above Limited model with a blown freeze plug. This is my first car, it was garage kept and only has 48,000 original miles on it, it was a gift from my grandparents and belonged to my great grandmother. I have to replace the freeze plug along with my A/C compressor which together is going to be more than the cars total value. Any suggestions on what I should do? The freeze plug is already out of the engine but I'm not sure if I need to replace it or just reinstall the one that came out of the block. The A/C still blows but makes a purring noise when I turn on the A/C or defroster. Below is a picture of the plug that came out of the engine. I believe this is a replacement which makes me think the engine has blown one before.