With the property market trending upward, it'll be challenging to find such a unit in choice locations, but it's not impossible.
Say you've an idea on which condo or even area you like, try doing a search in the URA website to see what are the RECENT transactions. That'll give you an idea if what you're thinking is realistic or not.
Search under: "Private Residential Property Transactions with Caveats Lodged"
Feel free to mail me if you've more specific questions.
Hans @ 97868860