The cheapest vape that works pretty well would be the Aromazap. Use to sell for $100. Now it sells for $135 USD. (that's including shipping)

Hotbox, Vapolution, and Vapor Brothers all have devices in the same price range.

VaporGenie is a pipe that uses an anti-flame screen. I think those sell for around $35-50 USD.

If you're looking for a healthy solution. And a solution that doesn't use lots of green ....

A vape is probably your best option. You can also cook with the dried leftovers of the vape.