flywheel?
 

anyone knows approximately how much will a flywheel for the 91 astina cost? thx.

What engine?

Between $40 and $100 depending on how much money a wrecker wants to make.

I guess if you call a few different places you could answer the question your self. Do you want a standard flywheel, light weight, new, used etc. Some wreckers will sell them cheaper than others depending on if they are machined or not and the condition of the ring gear.