I don't think we know if Galileo really said this or not, but it seems appropriate here. Billionaires can fund whatever they want, and it still does not change reality. In 20-30 years climate change will be so obvious that everyone will look back and say, "What were they thinking?" At that point the billionaires will say, "Well we didn't know then what we know now." Science is funny, it really does not respect opinions. It just is. We don't have to like, we only have to understand it. I guess waiting 20-30 years for the old billionaires and politicians who are wed to climate denial to die off is just the way it is. All we have to do is wait.

You can buy a refurb Tek 2465B with 4 channels and 400 MHz bandwidth for about $1300. They are easy to use, and trigger well. Of course they are analog, so it depends on how you are going to use it. For normal lab work they are great.

Any of calculators are good, and most will do more than you will ever need. When in doubt keep it simple. I teach physics in college, and I can't tell you the number of times I see someone mess up a simple problem because they either use the calculator without thinking, or worse yet don't even know how to use it correctly.

Whatever you do, don't let the calculator become a crutch. I actually had a student tell me they could not tell me the integral of a sin because they did not have their calculator with them. Think before reaching for the calculator. I usually race all my students to the numerical answer in problems doing it in my head with scientific notation. Usually I beat the entire class, and most of the time at least half the class gets the wrong answer since they don't know how their calculator works.

When in doubt keep it simple.