You might not like my answer, but I don't think your vise is worth the time or money to repair. If anything, I'd spend my time on Craigslist trying to find a vintage vise that will last the rest of your life.
Cheers!
Brian
I agree with Rileysan, but since you already have that broken vise, you might as well hold on to it while you are searching for a classic American made vise. Those Chinese vises break a lot in the jaws, so you might find a broken jaw one selling for scrap value or even free with a nut in like new condition.
Spend some time reading some of the pages over on the vise thread, post some pics, get involved in the conversation, educate yourself, make your wishes and your location known and I bet a great vise will come your way.
Do you go to farm sales? I've heard stories of great deals at those auctions/tag sales.
How about not only searching the for sale portion of your Craigslist, but also running a C/L vise wanted ad? it's free so what do you have to lose? Many flippers run hose ads so just realize that is your competition. Yes, believe it or not, there are guys who flip vises!
I myself have a few that I would sell for less than a hundred. Other guys have dozens of vises that they would probably part with for cash or an interesting trade. Too bad shipping is so expensive...