Play a short online game "Paper, Scissors, Ink" and register to receive $30 off when you spend $150 or more.
On registration the following voucher is displayed:
GM30 voucher
This voucher says to use offer code GM30 at checkout. So maybe playing the dopey game and registering isn't required at all!
This just doesn't really cut it when you've come off a 20bux free voucher deal with no minimum spend, but i'll +ve it since i got some good deals from staples