I see..what i do with my 5k budget10k are those from halfcut. If you just buy the engine alone without any other parts, it is probably cheaper but that will be troublesome for you because you need to source in other auxiliary parts such as radiator, wiring, gearbox and so on.
If you want a cheaper option, perhaps you can find a DOHC 4G93. Or if you want it cheaper, 1.5 litre 4G91 DOHC. It is less powerful but at least in future, you can upgrade it using 4G92 and 4G93 parts because they are from the same engine family.