I have many dotasia domain to renew (I have many domains to drop as well) and I have not seen any promotions or discounts in relation to these domains at GoDaddy.
There is an unknown registrar (for me at least) ix-site(dot)com who offer transfers including one year reg for asia domain at about $14 instead of $20 at godaddy.
If someone know something about the mentioned registrar or about the possibility of renewing asia domains at discounted price please let me know
I tried to use a promotional code at godaddy half year ago, it did not work and their support wrote that there are no discount for dotasia domains.

Thank you