You guys might wanna check out www.cheapriver.com. It's a site which compares prices across all the Amazon sites, and adds in the delivery rates so that you can really compare which Amazon site is the cheapest. It won't convert to MYR for you however (seems stuck at USD), so you still gotta do that on your own.

Cannot vouch for accuracy as I have yet to make a purchase based on this site's comparisons, but it's a great tool nonetheless!