I have been told your legs are the best machine we have. Walking and learning to breathe correctly for your medical problems. Then I suggest you use the money you would spend on the gym on a great vacation, or help someone who really needs help. Just my suggestions.

Water aerobics work great with COPD. You can do so much more in water. Medicare supplement plans often pay for these at YMCA etc.

Best exercise is enough to cause breathlessness, but without discomfort. On good days push yourself a little harder. On bad days just concentrate on breathing exercise. Walking n swimming are good, building stamina is most important, so your own body and light weights will be quite adequate, you do not need a gym, just a bit of discipline and self belief. A little help from friends and family can make this fun

I use, in rehab a machine where I it and exercise my arms and legs and it works good, also sitting in a chair and doing chest expansions help with weights

The real question dollydagger is how much is your budget for the equipment..set a budget and then the answer will be easier to get to....