The most common type of Jedi is like a government employee, they are issued required gear. You don’t just get given one for being force sensitive.

Those who build their own could totally be buying the crystals or something, not milling and crafting all the parts themselves.

A wand for wizards in hp feels like a cellphone today. In general you go get your own, and you’re paying the wandmakers for their craft.

Edit So maybe a freelance Jedi could pay a special machinist who knows how the crystals work