If you popped most of it out you should be able to have the rest filled and the paint blended the rest of your truck.. I think your taking a fender or door approach to your bed.
Truck beds get fixed all the time, not replaced unless totally mangled and messed up. Yours looks like it's fixable. I'd at least get a quote from a good local shop. Most will work with you on price if your paying cash. If you wait a bit until they get slow it's even a bit cheaper ( which is right about now). Just don't put it off until the first snow fall, then all the people who where driving around on bad tires swamp the shops.

 

OOps just checked your loacation. Forget about the snow part.
My guess would be before all the snowbids show up and the summer tourist leave. LOL

 

I had a very simliar dent in the bed of my last dak. From a motha f'ing deer being stupid and running into the side of my truck.. but took it to a decent body shop and they quoted me at about $200, ended up costing $118 or something like that. There was only one tiny spot that the metal got pinched that you could barely tell when they were done and the paint was blended perfect.

Edit: that included the price of a new tail light too, which I can't really tell if you need.

So what did you do? Hydroplan and tag a telephone pole like my sister did last week lol. If you don't tell us, I am going to have to assume rt is right on this one...