There a lots of good flaring tools that are relatively inexpensive
This has more than enough to get you by:
http://www.amazon.com/OTC-4503-Stinger-Double-Flar...
This one is just a standard flare tool, and will work fine for what you want to do:
http://www.amazon.com/OTC-4503-Stinger-Double-Flar...
I have an $65 blue point flare tool that I used for years. It works great. I recently upgraded to a hydraulic flare tool. but that's over your price range.