Just recieved the plectrum punch and as I had been and purchased a sheet of plasticard from a local model shop for £1.50 I decided to have a go. 2 runs down the sides of the plasticard gave me 20 white 0.5mm plecs, next onto my expired bank debit card, 3 green Lloyds Bank one's with chip still in place, NHS Direct card 3 blue ones, couple of RAC ones.
I already have enough from one 5 minute session to last me ages, as i usually pay 60p-90p each for a single plectrum I reckon it will pay for its self shortly. Sturdy, robust, brilliant bit of kit.