I have for sale a brand new Chinese copy of an Atlas BT10 bipod.
If you've looked into these the word on the street is these are every bit as good as the real thing not like the crappy Harris copies, they've got this one spot on!
All the same functionality as the Atlas which costs £2-300 even weighs the same as the original.
Quick release cam lever model (which has adjustable tension)
Comes with leg extensions and QD rubber feet.
(saving up for a Javlin)