Whatever the price, it's like 10x if there's a Panzer IV bearing down on your position.
Probably not much if it's a Panzer VI, though.
Better than nothing, and the PIAT could still do the business on occasion:
(Major Robert) Cain appeared to have developed an intense loathing of tanks after the bitter experiences of his Battalion on Tuesday 19th, and he personally saw to it that as many were destroyed as possible. If ever armour approached then he would grab the nearest PIAT and set out to deal with it himself. On one occasion, two Tiger tanks approached the South Staffords position, and Cain lay in wait in a slit trench while Lieutenant Ian Meikle of the Light Regiment gave him bearings from a house above him. The first tank fired at the house and killed Meikle, while the chimney collapsed and almost fell on top of Major Cain. He still held his position until it was 100 yards away, whereupon he fired at it. The tank immediately returned fire with its machinegun and wounded Cain, who took refuge in a nearby shed from where he fired another round, which exploded beneath the tank and disabled it. The crew abandoned the vehicle but all were gunned down as they bailed out. Cain fired at the second tank, but the bomb was faulty and exploded directly in front of him. It blew him off his feet and left him blind with metal fragments in his blackened face. As his men dragged him off, Cain recalls yelling like a hooligan and calling for somebody to get hold of the PIAT and deal with the tank