Ah, my favorite topic..so full of landmines LOL. Chuck's comment is spot on IF you can get a manufacturer to "bite". If the app provides sufficient value (data) they can't currently get at a similar price and similar quality, they might. I would pursue that approach for the mfgring side of the tabled.
Re consumer side, I would add that the results of any testing approach will be heavily impacted by the question(s) you want answered. And quite frankly conducting focus groups is qualitative and directional in nature and you should really not depend on that feedback for making business decisions for this reason: even if the participants are screened correctly, and the moderator delivers (which is not always a given), having 3 or 4 groups of people talking about the product is not the same as demand for the product - which is really at the heart of what everyone wants to know.
Demand is influenced by many, many things, and a $6k test will not tell you what demand is. For example, in my previous role we ran several different types of tests aimed at specific topics - ease of navigation, UI look and feel, consumer profile most likely to buy or try (as the case may be), branding framework, messaging components, and playability. The consumer profile measure was 2,000+ screened participants and contained various measures of purchase intent to see if we could get consistent demand sizing. To top it off, even with that, it was not designed to measure breadth and depth of purchase, which is critical in creating a sustainable business model from the revenue side.
Try Chuck's approach - it can work. If not put some real thought and focus into who should be included in the smaller $6k study, and find a research firm that clearly understands your question and is honest in what can be done for the $6k and what cannot. If iterations can be done in the real world cost effectively, and mgmt understands the product is not prime time but in development, then nothing beats that feedback.
Some will disagree with me on this but at some point though, before too much money is burnt through, I would suggest some quality insights into demand be done. All too often "new and cool" doesn't last and what looked promising at the beginning turns out to have no real legs to last. Now, of course, if over time, you have sky high conversion rates, your churn rates remain low, and your LTV consistently exceeds acquisition cost, then you are on your way!