GA Firing Line still has at least 10 or so SBA3 braces without the tube in the clearance/bargain bin for $65 each. Most online places charge over $80 for the brace only. Mine came with the QD sling attachment and fits great on a Vltor A5 extension with 3/4" space to the castle nut(pull down at the pin and don't depress the adjustment button to install).