@abemedina after trying a few vendors over the last year. Ive settled on 2,
nexaph and crush. Both offer great pricing/testing and offer kits. Communication and transparency in my experience have been great with both companies. As some have mentioned EZ is good for single vials as you're testing things out. Id say look at crush for single vials as well since you can build 3 or 5 vial kits with a discount added.