Actually the soles on these are cemented , so they may not be repairable after all.
You'll need to have a qualified shoe repair shop take a look at them to ascertain whether they are repairable.
You do not have your location noted, so I have no idea if you've got any resources available in your area.
Here in Tacoma, there is exactly ONE good shoe repair shop (Alex 253 588 8949). In Seattle the "go to" guy is Dave Page, who does all the repair work for REI locally.
As I recall, the last time Alex resoled my Wescos it was about $60 or $65 dollars.
A couple years prior to that, he resoled my Galibier Super Guides for about the same amount.
I would suggest looking into a high-end boot like a Wesco or White if they're something you're using and working in on a daily basis. The other brands noted thus far in this thread are, respectfully, simply temporary substitutes. Really good boots cost a hell of a lot of money now. I think I paid about $225 for the Wescos and that was about 15 years ago. (And I had to drive clear up to Port Angeles to find a pair of size 13's)