There are a a few basic styles and dozens of cheap knockoffs. By cheap, I mean cheaply made, not always cheaply bought.

-Globe style. Been around for decades, not very good.
-Whip style. Invented about 9 years ago. Original Vapor Brothers box style. Effective, quick, strong flavorful. Better quality parts than many of the others. $170 See tutorials
-Knock offs of Vapor Brothers. Various shapes and styles in wood,metal,plastic; square shapes, round shapes and box style. Some ok, some really bad. Plastic ones stink. Cheap ones don’t work for very long. 40$-200$
-Volcano and other bag styles. Some folks just love the Volcano. Not as quick as a whip style
-Knockoffs of the Volcano come in lots of styles, and don’t look like the Volcano. Knockoffs don’t work as well as the Volcano, and many of them stink. up to 500$
-Natural goods/ forced air style. Don’t remember who made this style first, there are a few knockoffs of it. Most of the ones I’ve tested worked, some had bad smells and cheap parts inside. Heater failure was an issue. 200-300$
-Vriptech. Sells a heat gun and a huge bowl. Works, but noisy. Also have a corded hand held (looks fragile). 150$ and more
-Vapir. Generally weak. They have a hand-held too. Plastic smell.
– VaporGenie . a hand held pipe with a method of indirect heating. Easy to carry, cheap to own.
-Other hand helds. Iolite and others. Most of the newer knockoffs and hand-helds are plastic and smell bad.
-Simple methods or handhelds. buy a big bowl and a heat gun at Harborfreight.com . Use a magnifying glass on a sunny day, adjust distance to bowl, try not to burn. Use a glass bat and heat it lightly from outside the glass, try not to burn.

Happy hippy daze to you.