It’s been a long time since anything was “as free as air“. Now, if you need air, it’s going to cost you quite a bit to fire up the compressor at some nearby convenience store or gas station. If you do this 10 times or so, you might as well just buy your own portable air compressor and have air anytime or place that you need it. Not only will it save you money but you will have air on hand any time you need it.
Modern portable compressors are so small and so inexpensive that it is easy to just toss one into the trunk of every vehicle you have. It is also important to let everyone in the family know that there is a compressor in the trunk and how to use it. Without this knowledge, they are useless.