Based on bedok median 3 room resale price by hdb web at 3rd quarter 2010 , it is possible to get one below 300k.
As for the COV, it is based on willing seller willing buyer basis i.e it is between the buyer and seller to agree on the COV or none or below valuation. therefor it is hard for me to say defintely can.
What i can do is to hunt a unit selling at or below valuation.
Also you will need to apply for HLE before you decide to search for one as the approval may take 2-4 wks
Feel free to email or cal me if you decide to engage my service.
CEA Reg: R012218E