If bitcoin cost you money then surely you will have to invest that much before you can in place the same.
What you can do is -
1. Partner with someone who is like minded and divide your investment funds.
2. Obviously this will get you same share of money back which you poured in.
Thats the only option you have if you want to spare little money on it.
Before that. .
Check with the legality that you are allowed to have bitcoin ATM machine in your region. You will need lots of approval for this to set up. Its not like buying the car and putting for sale in the city centre! Isn't it.
This dude is right. @OP how much would it cost to have a Bitcoin ATM machine? You also need to consider the security of your ATM, i'd rather choose a bitcoin swipe machine. I think it is much cheaper.