You're going to be looking at a
mod. None of the proprietary
batteries are capable of going that high. If you want a box
mod madvapes has a variable volt mod for around $35. You can set it at 5v or anywhere else you wish. If your looking for a 5v tube you're probably looking at $50 or more. The cheapest I know of is the Gold Digger from Ace of Vapes which sells for $55.
Also if you have some basic soldering skills Madvapes sells the above vv mod in kit form for much less, would then be well within your budget.