just wondering if there are any out there to be bought I am looking for a 20 inch Marlin CBC

With Marlin under the Remington umbrella, seemingly going down the tube, you definitely want an older one.

Getting one at a decent price may prove to be a challenge.

You may want to check over on the SASS site under classifieds. Sometimes you'll see one for sale and many have been slicked up for CAS.

DF

Last one I seen online went for $1K in 45 Colt

1k on the low end right now