I built one of those with a laser lens from a friend’s- so no cost for that and I had parts round from other projects. The stand gives stability. I also added an extra hole for a stabilized regular shot with a movable block to give a different distance. I have not used it yet for iNat and I was waiting for that before I posted on the life hacks thread but here is what mine looks like.
And a close up of a Canadian dime
$10 Smartphone to Digital Microscope Conversion - Instructables link