I am trying to find some soins with passive income. I know that Neo generates gas, some coins have nodes.
What coins do you know with cheap nodes (less than 1k USD) or other coins that have staking mechanism?
You could check
http://mnrank.com/ for masternodes and their ROI. When you are looking at those nodes, don't forget to check the ANN topics about coin inflation and other factors what could screw the price.
NEO is now too expensive.
I would not agree to that. I am bullish on Neo. As soon as Neo rises in price, so will gas. So expecting a price rise your actual passive income on gas might be a lot higher as it will rise with Neo.