Depends upon how handy you are....I took a diesel turbo..it was cheap and installed it on an old 3.8 Mustang v-6..along with cheap waste gate and bov....it was a temporary project just so I could learn about turbos. If I blew up the motor no biggie cause it had about 170,000 on it. The used market on turbo components can net you a turbo, wastegate and bov for about $600 to 800. But, you'll have to fab up the tubing and play with vacuum lines etc.....
You can also go the used centrifugal s/c route. Beware of tired parts...a turbine can destruct and do some serious damage to the motor.
Lastly, either system requires "tuning".