I would recommend this new product from Slate Lock (www.slate-lock.com) for your HDB/condo padlock, they have launched a new version of their fingerprint access padlock. I got two for myself & it have been working great for almost 6 months now.

The padlock has a built-in fingerprint access sensor, at which you just need to scan your finger to access the padlock - think how convenience it is. I never need to bring any keys or worry where have I lost my keys. Two thumbs up. Really good & efficient, especially for busy mummy like us who always forgot to bring keys.

You can check & order from their official page here http://www.slate-lock.com

But I got mine at a really bargain price of about $70-75 only from some Online retailers (Gmarket/Q0010 SG/ebay.com.sg)