MX50orFREE50orcbd50
So its a max of $50 credit split up into 10 x $5 vouchers at the clubdeals.com.au website. The website looks to be only a Melbourne deal website as of now.
Use MX50 voucher code when signing up and it will automatically apply to each purchase.
Credit is only available until the 17th of July, so its a good chance you wont use all of it but it may be worthwhile on a few offers between now and then.
Mod: Edited URL to point to clubdeals. Added 2 more coupon codes.