The INH is available or it will be at
www.lacentralevapeur.com , don't know what you meant by readily available so you can always try them. I must warn you though, that the INH might not be the best for bubble/hash. The better option for that is the Solo.
The DV has an oil can though that should work okay.. from the reports of people who tried it there are improvements to be made still and i think someone as already applied some minor fixes to the oil can process.
Between the DV and the Solo, the biggest difference between them IMO, is that the Solo has the better taste and the DV has the better stealth, this according to my own preferences in a vaporizer of course.
I could not tell from your post, if you were going to use it much outside the house, in a public venue. I think that might be the decisive factor here.