The Buckhorn is no longer in production, so you will need to check the used market. Amazon, Auctionarms, and Gunbroker would be good websites to check for selling prices.
75-100
For a Bushnell Buckhorn 3-9x40 rifle scope, you'll typically need a scope cover that fits a 40mm objective lens. Look for a cover labeled for 40mm scopes, which should provide a snug fit. Brands like Butler Creek or Vortex offer universal scope covers that can accommodate this size. Always check the product specifications to ensure compatibility.
There are several different models and magnifications. This is an entry level scope, and is in the $20-$50 range.
whats the of a bushnell scope
Contact Bushnell
A Bushnell 3-9x40 variable scope
One can purchase a Bushnell spotting scope from retails like Amazon, Optics Planets, Optics 4 Birding, Yahoo! Shopping, Bushnell-Store, eBay and Midway.
Check with Bushnell customer service thru their website.
Adjustable Objective
http://www.bushnell.com you call or go to Bushnell's web site and give them the serial number
40.00
Tube diameter is 1" on that scope