The GVG is kinda pricey. It's a wonderful device though for freebase.
I REALLY suggest you check out enhanced leaf and/or a changa blend. It's extremely easy to make, requires very few materials, and is for the most part full proof.
It's where the dmt freebase is infused into the leaf blend through the use of a suitable solvent, be it alcohol/isopropyl/etc. You can just smoke it in a pipe/bong like you would cannabis or something. You don't have to worry assomuch about how far the lighters positioned, temperature, etc. You just cherry it, drag it slow, and one or two big good sized hits and your well on your way.
Here's the link for the WIKI/Dmt Nexian Handbook.
Dmt Nexian HandbookGo to section 14.1
It has a wonderful pictorial on how to make enhanced leaf. (
And if you would choose to add extracted harmalas, then that would make it "changa")