Home Depot has an Apollo PEX clamp tool for $29. It works on PEX clamps from 3/8" to 3/4". I found the tool is not the "expensive part" of the system, but the clamps seem to be expensive. They work, the tool is essentially "fool proof" and most repairs (if you follow the instructions) are permanent and correctly done. Otherwise, the tool won't release from the clamp (indicating the clamp is not properly crimped)....
https://www.homedepot.com/p/PEX-Crim...OOLC/303711230
I'm sure Lowe's and most big box stores have similar low cost crimping tools. There's no need to buy the "professional $75 model" for the average do-it-yourself project.