You should be able to p/u a 1.9 for $50/100 usually the yard you get it from
will have just cut it out of car so you may get PAS/AC etc thrown in.Bear
in mind their emissions laws mean all cars for last 30 years have had
much more sophisticated managment with cam/crank sensors fitted
to everything so any second hand motors will have all these fitted
as well.
Last time I was there I bought 2 BRand new 1.9's for $300.
Suggest you contact JE or similar for pistons whilst there (half price
of UK)and someone like Arrow performance for rods/if budget would stretch
you could maybe pick up a set of their titanium rods.......