I buy most everything that's not fresh produce on Amazon. This is what I get and I absolutely love it! NOW is generally my go-to brand for a lot of stuff, supplements and melatonin and valerian root and all sorts of witchy vegan stuff.

I've tried the nooch from Frontier Co-Op that /u/Nalaku linked, in fact it's what I used when I first discovered nooch - went through two 1lb. bags over the course of a month before switching to NOW. Something to bear in mind is that Frontier's nooch is non-fortified, meaning there's no B12 added, so you'll have to get your daily/weekly B12 fix somewhere else. Nothing against Frontier Co-Op, I absolutely love their bulk herbs and teas! If you're already taking a B12 supplement separately you should have no problems.