LashNeo

are you looking for a mazda familia registered in 1997 or manufactured in 1997?
if it's 1997 registration you might be talking about either BG series or BH series.
if it's manufactured in 1997; you are talking about the BH series which is commonly known as 'Samanala light'
model in SL market. So, which model are you interested in?

Spare parts are easy to find around Colombo. There are some places in panchikawatte who specialize on mazda parts and Mazna motors Aththidiya has stocks available for any body or engine parts.
Fuel economy would be 8-9 kmpl for an Automatic within city limits and above 11 away from city. it would do about a 1-2 kmpl more for a manual one.
Second hand market is not bad. Would be the same as FB15, 110 etc.

Mazda Familia/323 was manufactured from the 1960’s up to 2003. The BJ series was the last series of the familia/323 which came out of production on 1998 and continued until 2003. BJ5P has an engine capacity of 1500cc while the BJ3P has an engine capacity of 1300cc. BJ series has two variants. A pre-facelift model which came in 1998-1999 and a face-lifted version which was produced from 2000-2003.
Face-lifted model is famous as the ‘Prado’ light model in the local market and it shared the same chasis as the pre-facelift version. Only difference is the front face which looks newish due to the differences in headlights, grill and fog lights etc. and some interior trims like door handles, steering wheel etc. however; there are plenty of pre-facelifted familia’s that have been converted to look like face-lifted ones as the modification is fairly straightforward.
The price would range from 1,600,000 to 2,300,000 based on the age, condition and options etc. The high spec versions with full options such as VVT engine, Trip-tronic gear boxes, climate control A/C, all disk brakes etc.  would be priced over 2,000,000. I know the prices are way too high for a car of this age. I know this for a fact as I spent only 14lakhs on my BJ5P in 2009. But; that’s how our crazy local car market operates. Then again, If you think about the absurd prices you have to pay for a reliable brand new family sedan; these prices might look OK right?  
There were plenty of variants of the BJ series with minor differences. Do some searching on the net and also in auto lanka. You will find plenty of information on the variants. I think there were plenty of discussions on this in auto lanka.