There are many organic shops in Singapore. i find the following prices for organic vegetables and fruits comparatively cheaper.
Organic for lesshttp://www.organic4less.com/
Kampung Senang on Sat (11am - 2pm)http://www.kg-senang.org.sg/saturdayMart.jpg
Fireflies Organic Farm
Lot 75 Lim Chu Kang Lane 2, Singapore 719842
BLISS AND WISDOM SOCIETY
23 Lorong 29 Geylang #04-02 S(388072)
Tel: 6547 1580 Fax: 6547 1581 Email: firstname.lastname@example.org
You can find a listing of the organic shops in Singapore in Lapis Lazuli Light Quarterly Newletter. The list is grouped by region (east, west, central, north) and indicates whether a shop sells organic vegetables, makan or products.
[Edited on 30-6-2006 by Shan Xue]