most stock engine parts you can get locally from bamboo and certain parts place but if you want to modify/build the engine, parts are fairly expensive (compared to b16a), and are hard to come by. You will be finding your self having to order aftermarket parts online or through a dealer
average cost of a manual h22a black top jdm engine is around 10-14k i paid 11k for mines good luck with you swap if u choose to
had mines in my ek sedan for over 3 years now loving it every day!!!