A whole B18b swap would run you less then $800 if you found the parts privatly. If you go to somewhere like Japan Star would charge you a bit more then $1500 for a swap.
It doesn’t take much to swap a vtec head on. If you luck out and get the early model 93’ Civic, then the vtec wires are already there in the engine bay. Otherwise you just have to run about 5 more wires. They make a chip kit for about $40 to convert your ecu to vtec.