Home Depot offers the DeWalt Medium and Large Trigger Clamp 4-Pack, model no. DWHT83196, for $29.97. Choose in-store pickup to avoid the $5.99 shipping fee. That's tied with our October mention and the lowest total price we could find by $19. It includes two medium clamps with a 100-lb. clamping force and 2-7/16" throat depth and two large clamps with a 300-lb. clamping force and 3.25" throat depth.
Note that for Prime members only, Amazon charges the same with free shipping. It's currently out of stock, however it can still be ordered at this price for delivery when available.