Saw a the sign in store today at JB HiFi World Square (Sydney), but can't find any reference for this in their website.
I know that you can get the 20% if you sign up for their newsletter or something, but for this one, you don't need to sign up for anything.
There are exclusions for the 20% off, and the discount is capped at $20.
The exclusions that I can remember are mobile phones, gift cards.
Update:
T&C's from Catalogue, They managed to fit it on 2 very small lines.
"Purchase a JB gift card for a minimum value of $50 in store and get a bonus discount voucher up to $20. Discount voucher is for 20% off product purchases up to $100 only valid in store. Voucher valid from day after issue until January 30th 2015. Only one voucher issued per transaction. Maximum two vouchers per Customer. Redeemable in store as single transaction only. Products excluded from purchase with discount voucher, Mobile Phones and mobile Phone Contracts, Pre-Orders, Agency Products, Pre-Paid Products & Gift Cards. Maximum discount of $20 discount is calculated off current ticket price, Voucher can only be used once, and must be surrendered upon use."
it is national wide , also printed on their latest cataloug
It basically means nearly all there in store games r 20% off as most of their price are between 50-100
Buy the GC before u pay at the counter