Ask the agents around that area.
They know the market better than banks which includes rent for FF, PF and NF.

Yup, there are only agents want to put food on their table.
Find one that puts food on his table as well as mine.

A good agents who close lot's of deal in that area, some work very closely with a bank and help the buyer on the finance. They know the market, bank that deal with them knows the pricing of that area too.

Some banks don't finance that particuliar area a lot, hence very hard for a valuation on sales price.
Sometimes a valuer is needed.
I remember someone mention go to a local branch of that area, would able to get the valuation price.