Cheapest its been to my knowledge..
Challenge Xtreme 3-in-1 Staple Gun Kit £5.99 WAS £14.99 Argos (Free C&C)
Rated 4.4/5☆'s from 420 reviews
The versatile Challenge Xtreme 3-in-1 staple gun kit is ideal for general household fastening tasks enabling you to fix up to three different types of fasteners. With a choice of variable pressures this staple gun kit, complete in a useful plastic carry case, allows you to smoothly fasten staples, U-shaped staples and nails.
Staple gun kit.
Size H4, W27, D22.5cm.
Accessories: Includes carry case, pressure control knob, 500 x 1.2 x 8mm staple, 500 x 12mm u-shaped staples and 500 x 10mm nails.
Carry case included.