Well, you just said it right there. There are alternatives for your tubes. That's why you don't feel badly.
An alternative for the stocks? Nope. So that point is moot.
It may be legitimate (legal, I assume you mean), but it has nothing to do with being the RIGHT thing to do, which you know is my point. However, gouging is never a proper response to anything, anyway.
Raising your prices due to low supply and high demand and flat-out GOUGING are 2 different things. Over tripling the price is ridiculous.
And yup, I would gladly buy an equal, alternative stock for less myself.