Don't think Terry is into squonkers, I have half a dozen, but not a VF one, I looked at one and it looked like it was very awkward to get the bottle into it, one of the cheapest fairly good ones is the
Kangxin Inoy which is a 60w TC squonker - only problem with mine is that when it wakes up it always goes back to 60w, which is okay in TC mode but not very good if using Kanthal. There aren't that many clone squonkers around, svapiamo.com does some nice SX350 & SX350J ones that are a reasonable price, think he puts them up on a Friday evening 20:00 GMT so about 12:00 your time, but they go fairly fast, I have a normal SX350 one, and it's probably the best of the ones I have apart from my expensive Squonk³ which is also a SX350.