Some wrong information you guys gave here.
1. Maybank Singapore and Maybank Malaysia are DIFFERENT. You CAN'T use Maybank2U online banking for transferring money from Singapore to Malaysia directly.
2. If buyers from Singapore wants to send money to you, they will have to use bank Tele-Transfer, even if it is Maybank Singapore to Maybank Malaysia. Singapore bank will charger buyer around S$22 (around RM50). When you receive the money, your local bank in Malaysia will change the S$ to RM according to their own conversion rate, and they will charge you some fee (cant remember this one) for the TT.
3. You can try PayPal if you want, currency will be in either USD or S$, but you can't withdraw money from PayPal in Malaysia, please take note.
4. You can send via PosLaju, which is very safe. Takes around 3 days to reach Singapore. A bit expensive though.
5. Make sure you dont send illegal item. For normal item, there is a certain value limit before kena tax...

I will write an article perhaps on this one at ECMalaysia.com soon

Regards,
Kho King
www.ECMalaysia.com ~ Electronic Commerce in Malaysia!