Exactly. That is NOT a fixable fork. If this was a rare bike and the fork needed to be saved at all cost, you'd have to strip it, send it to a framebuilder and have a new post welded on (probably both sides so they match) and then the fork repainted as original. How much do you think all that would cost? It might be worth it for a valuable collectible bike. But you're in luck - yours is not a rare or collectible bike and you can replace that fork with a generic one, completely installed, for only $80.

There is also NO hack that has been mentioned that I would trust. Those are your brakes, man.

You might find a cheaper fork at a coop but consider how much you are really going to save and how long will it take to find just the right fork. Remember you need one that has the same or longer steerer tube length, so that limits your selection even more. The bike shop is going to cut that 250mm tube down to fit your bike exactly, so you need to find one that is at least as long as the one you have now. I have replaced forks on several bikes and sometimes they can be hard to find with a longer (or preferably uncut) steerer tube.

I honestly believe the best thing is to let your local bike shop install the new fork. They did the overhaul and already have an affinity with your bike. For $80 they can put you on the road with a new fork, installed properly and that has safe brakes. Seems obvious to me.