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Training images: there is a tension here. You need to know if what you are asking is specialized knowledge (say machine parts) or you can get away with currently available ones. So unless what you need is very general, the answer to that is yes.

Cost: Firms that know what they are doing ain't cheap. It is a simple cost structure issue. Think about it, a single AI guy may cost around 300K year just in salary, so that is a starting point from the cost point of view. They have to make at least enough to cover those costs a year. Now a interesting tidbit that is not known much, not all AI guys live and breath in the United States (aka SV, NY and Boston). Our company is based in Argentina, and we built among other things face recognition software and done research for big names in the states. So if costs are prohibitively, think about shopping off-the-coast, you will be surprised.

Given that you don't have any real target, anyone skilled enough will interview you and figure out pretty fast if you understand what you need. If they push you to give them targets for say accuracy and you cannot back up why you need X or Y, they will know you are not well versed and because of the risk:

1) They pad their cost to deal with your uncertainty.

2) The most professionals will plain refuse to do the project on those terms (I know for a fact because we had rejected many because the clients were not ready to pursue such an endeavour).

Now the most important, there is a lot of smoke out there. Today doing ML work is cool and fancy (so everybody is doing it, right?). Truth is there are not many that know what they are doing, chances are you will end up in a bad spot if you are not very diligent. That is why I suggested first to do the pre-screening UX work first before committing to anything. You will be embarking on the path, only if it really makes sense and you will have spent say 30K to figure out that probably you don't need it, or you need to build something so constrained that you can get away with very rough and trivial tech.

If you go to a firm and ask for a classifier they will probably build you a convolutional neural network or RNN or whatever, sometimes you don't even need that. We had a client a year ago that needed something very specific, they asked us a quite intelligent OCR essentially. We could build it, or retrofit a commercial one, but working with them on the pre-screening we figured out that the use case was actually pretty restricted and because of specific constraints we were able to build in 5 days a solution that is in production to this date (plain old template matching did the trick). They spent 20K up-front, they end up saving 300K+ or even more in the very short run (and have a product out there in 3 weeks instead of 6 months).

How would we do it? In those cases we start with a very small project to figure out what kind of technology we actually need, that may involve UX work or plain ML MVP creation work. Aiming to keep the costs as low as possible with the idea to have something that we can actually test and figure out if that is good enough to be part of the product. Sometimes that involves just incorporate some pre-trained model that you could retrofit, other times it involves scanning for the state of the art and figure out what you need to build in order to achieve the goals. But, in order for that to work, there must be a constraint in time and the understanding that you are diverging toward a solution. It is essentially risk management at its best. I wouldn't trust anyone that doesn't start like that for a brand new Vision based product/feature.