Yeah I'm in a pretty good area for it - my buddy researched and found the miners. Like Just said, good luck getting one now but I'm pulled $400 from mine last month.
The reason I'm mining Helium is the process is much less energy intensive than Bitcoin or something. They actually use radio transmitters to verify the transactions so it doesn't take much energy. I haven't noticed a dent in internet performance and the miner only uses about the same amount of energy as powering a lightbulb. The miners cost about 400-500 so if you have a good connection you're repaid in about a month's time and after that it's pure profit.
Edit: One last thing about helium is that if you're interested, check your area - if there are multiple miners in the same geographical area rewards are reduced. If there are already 1 or 2 miners in your area wouldn't do it. I was looking at New York the other day and there are like 30 miners in some areas and those guys are literally making like 5 bucks a month.
Here are some in the Des Moines area for example.