A few tips.

Beware! The 'cheapest or most economical' will probably cost you more in the long run.

There's a big difference between cheap & good value.

Go to a jet fly or a club that flys jets, see what works reliably flight after flight & make a decision after talking to them.

Be VERY careful buying used turbines unless you know the seller very well.

Avoid Jet Joe turbines no matter how big a bargain they appear.

Keep in mind quite a few RCU members also distribute jet products & this may colour their recommendations.

Good luck & welcome to jets, it's a hoot! - John.