Pretty easy this one. Top right of the main Borders page, under join shortlist email….
Fill the details in, doesnt even have to be legit - at the end of the process - it points to a page to printout for 20% of any 1 purchase…
THIS IS A GENERIC BARCODE SO SHARE WITH FRIENDS ETC!!!
Easy enough to print two or three copies and take the Mrs with you for another purhcase at the same time…limit of one per purchase per customer…easy to circumvent though!
Pretty sure everyone knows this, plus it is here:
http://www.ozbargain.com.au/wiki/store:borders.com.au
"20% Off One Full Priced Item
A 20% off voucher is available when subscribed to Borders Shortlist email newsletter. Upon joining you will be led to the 20% voucher page. No initial email will be sent and yes that means a fake email or even non-accessible email address (eg. [email protected]) can be used.
The bar code is identical and the expiry date is 10 days after joining. "
Sorry :(