don't buy bonds - invest in bonds instead
sciprof, don't buy bonds - invest in bonds instead as part of an investment portfolio, if your intention is to grow your money.
in my opinion, just buying bonds alone holds risk of losing to inflation and watching bond price drop if interest rate rises. one can buy new issues of Singapore Government bonds through DBS/POSB internet banking also.
To invest in singapore government bonds for long term, you can choose to hold the bonds in a diversified investment portfolio together with other assets. this way, the entire portfolio has a better chance to grow in value through time as different assets can help overcome each other's weakness in different market conditions. You can stick with such an investment portfolio till you need to liquidate it for the cash.
the Singapore Permanent Portfolio is one such DIY investment strategy that invest using Singapore Government 30 years bond among other assets - the assets are chosen based on economic cycle theory and the entire portfolio is designed to provide more consistent market returns and capital protection.