If this is for home use, there are lots of good impacts at the pawn shops. I've seen lots of them for $20 to $60. Many shops have a compressor so you can at least free run it to see it work. Despite what all the naysayers will tell you, impacts are fairly forgiving and indestructible, clean it up and oil it and it will last years in a home shop. 99% of what you are doing is probably removing wheels, and if you have had them off before, and properly torque them, you don't need some huge powerful impact. beyond that, a frozen bolt or two, and a few rusted front end parts......
Think about your "mission", are you at an 8 hr day shop job, or a weekend warrior?
Charles