I figure you’ve done your base groundwork, but just in case, I’d also run through all available information at https://coinatmradar.com/how-to-start-bitcoin-atm-business (not all reports are recent though), and since you are in the USA I presume, I’d go through the lists of operators in your area (and others that are willing to expand). For example, there are currently around 10 operators in Chicago behind 263 BATMs. There’s also a section on the site with first and second hand ATMs, but it looks pretty outdated and scarce on the ATMs from manufacturers list.

Looking over some published prices, finding a new two way BATM for under 3K$ may be a feat, and perhaps a second hand one may comply. Even so, one would need to match the price against features and support.

This week I stumbled upon a different sort of device, a BTM, that is being sold at least in some South American countries (see re: First Bitcoin ATM in Venezuela). A BTM has a different business model though, since it requires a shop assistant to perform the TX, thus part losing the anonymity that you get using a BATM as a customer.

I can't help you with the ATM thingy since I haven't even seen one personally nor tried it. And I also have no plan of it as a business but you should also consider the popularity of bitcoin in your place. Whether there are a lot of users that might use your ATM or not. Start your planning before purchasing one. It's always better to start with a plan. Estimate if you'll be able to gain profit from it, how big is the possible profit, and the time.