If you're looking for blinds for outdoor use (eg balcony) i think you can't get standard ones. Try the yellowpages.com.sg and search for bamboo chicks. There are some companies that can make waterproofed/treated bamboo blinds for outdoor use. (Can't remember the one I used, sorry, twas a few years back)
Another source:
http://www.singaporemirror.com/ps_bamboochicks.htm
The good thing about custom making them is that they can be made such that water doesn't run into your balcony when it rains heavily etc. Unlike the standard ones that you buy off the racks.