you need pay S$15 for deposit, and they can not confirm with you if we can play wow in singapore, but from what i read in various forum, most likely we can play in singapore using gamecard. you can call them and use internet-banking to transfer the booking deposit. here is the contact, hope useful to you.

#05-15 Funan The IT Mall
Tel: 68373248
Hp: 93879522
Email: deli@gamescore.com.sg