Sears offers the Irwin 6" Locking Clamp, model no. 18, for $6.83. Opt for in-store pickup to dodge the $4.99 shipping fee. That's tied with our mention from a month ago and the lowest price we've seen. (It's also a current low by $2.) It features a guarded release trigger, wide-opening jaws, and an alloy steel construction.
Of note, Shop Your Way Rewards members will earn a Sears credit with this purchase and may be eligible for additional credits and discounts.