I own an old Sako Finbear in .300H&H with a ugly monte carlo stock. Where can I get a Synthetic stock for this Sako and what are the Prices for this stocks?

take a look at the McMillan line of synthetics, believe they can get you set up with one. Rimrock is another. prices will vary from a blank cost of 295.00 to a finished for average 400-500 bucks perhaps even more--give them a call.

Since you used the term "Finnbear", I assume your gun is built on the L61R action, but check to make sure it is not one of the early Sakos built on an FN Mauser action before ordering a replacement stock.

It is a L61R, it is not a FN Mauser!