I bought from a local notebook parts store. It costs me 30USD for a ugly, simple plastic box :-X
There is a guy selling caddy
Or, you can contact this store - where i bought mine, maybe they will accept international shipping. Disclaimer: i'm not working for that store
Shop name: 1000-com
Address: 127 Le Thi Rieng street, District 1, HCMC, VN
The best way is to ask some friends travelling in VN to buy it for you.