I ran across this video just now and the first thing that popped into my head was "I wonder how much air it would take to levitate a DynaVap?"
Sadly, the DynaVap would need a curved cap on the top for the levitating to work.
In regard to why a Dynavap, it's really just price. You can pick up an "M" for the low end of your range. There's not a ton of "good" vapes at the 60-110 cost. Here's a good list by price range: https://www.reddit.com/r/vaporents/wiki/vape-consensus
At that price, Dynavap as stated before. I'd take the above advice and save up a bit more for a decent portable battery powered device if that's what you want.
Has anybody experimented with these? They are a little ceramic disc with a hole in the middle and two wires that can reach the temps we need. The one at this link even lists aroma therapy ovens as an application. I figure dropping a shouldered tube with a screen of some sort into one might work...