Play-asia is having 15% for most of all in stock items (not all, even though they said all in stock items..).
The promotion will run until the 31st of October 2008, and seems like you cant combine with coupon.
For non discounted items, you can use this coupon to get 5% discount: UK-GCS-BKJ (multiple use coupon, coupon only usable when you have $50+ total purchases)
hint: you can actually use the coupon, first you need to buy something that is not discounted eg: this one, then go to check out, put in the 5% discount code, go back and add the items that you want to buy, after you have added all the items you want to buy, go to “My Cart” and remove the 1st item (the non discounted one), and then hit check out, you will see the 5% off at the check out screen from the coupon that you entered for the 1st item
Click here to read more information about Play-Asia October sale.