I remember this site was launch for price comparison for Msian for smart buyer. Here you can compare price from all the supermarket and get the best deal. We tried compare the price, but after some considerations, it just impossible to run 3-4 places just to get cheaper price. In terms of time, traveling cost, it may not make sense for us to run multiple sites.
However, I think if you have the time to check out all the prices, it should come to good use. But I am not aware if the prices are updated or not, so use at your own risk.