Pman is 100% correct.
For $30 what you want is not possible---figure rule of thumb for 532nm lasers $1/1mw generally speaking --you might find a few better deals than that but not many.
Remember IR filter is important----IR is invisible can be a significant part of the output in low cost lasers---you want to know the actual 532nm green output without the IR
This makes very much sense. Thank you, I understand this much better now