Airgun Stocks

A factory replacement stock will always be expensive since the manufacturer needs to make a profit. Something handmade like Steve Corcoran of Woods and Water outdoors' stocks are the work of a skilled artisan with limited time. They will charge what they feel their time is worth. 
If they offer an inlet for the gun you have, Boyd's or Richard's Microfit offer laminate stocks for a very few models of airguns.
http://www.rifle-stocks.com/ 
https://www.boydsgunstocks.com/
If it's a springer, these folks are in the UK- all their stuff is Walnut
https://www.customstock.co.uk/customshop/
What type of gun are you looking to re-stock?
 
I used to think the same way until I made several myself. I will spend over 40 hours working on a stock. Even if you get one from Boyds unfinished, you may have several days sanding and finishing it. They are labor intensive!!!!!! JohnL57 has given you the only option I know. Although the Boyd stock looks good, many have been unhappy that the comb is too low.