Basically discount vouchers for Samsung PCs and monitors handed out at open days, the pictures are self explanatory. Enjoy!
Pro tip: ask for a discount first from the JB salesperson and they'll probably knock a bit back and don't mention the code you have. The code should be processed at the counter so it should be 20% off the price the guy gives you! :)
http://tinypic.com/r/sboaqa/7
http://tinypic.com/r/2dj4ahd/7
it doesn't say they accept copies of the voucher, so it will be hit and miss whether you get the extra 20%