can try Botak,
http://www.botaksign.com.sg/, they are not a print lab but do all sorts of printing for indoor and outdoor advertising. You can even email them your file for printing an collect them when it is ready (usually the next day) cheap and good (just printed 2 pcs of 25 X 36 inch for less that $20/-)but please note that they will not do any color correction for you.