Homemade carts

I see alot of people talking about making their own carts from distillate and that’s their favorite and most cost effective way to get cult carts. I was wondering if yall could point me in the right direction for a few things

1. Does anyone who makes their own carts have a suggestion on where to get the distillate from?

2. Where’s the best place to get the empty carts to fill up?

3. Do you have to buy like a needle and plunger or something to fill the cards with the wax?

Thank you everybody for the help!!