price wud be hard to find since these r rare engine...2GR-FSE lexus IS350 without supercharged is easily available in US i think 3000-4500$ depend on condition n yr....3GR-FSE is rare markx 300G engine....3GR-FE is IS300 engine maybe u can find it in GCC countries as there r many lexus IS300....4GR-FSE markx 250G is available in Pak...try Peshawar side