For low dose melatonin, try liquid melatonin. Around here Sprouts carries it, but you gotta look a bit to find it. The bottle says 30 drop equal 3mg. So you can take small doses easily, and it absorbs under your tongue pretty quickly.

most bricke and mortar should have at least 1mg tablets, and you can break those in half. or break a 3mg into 3rds. not perfect but should work.