Translation:I could have gotten a lot of things for that kind of money.
The Oxford Dictionary lists "gotten" as the North American form of the past participle of "get": https://en.oxforddictionaries.com/definition/gotten
"Got" is already an accepted answer and I have just added "obtained".
Correct, people can say/speak however they wish, but in a language course such as this, 'gotten' is very poor English, should not be used and is slang really. I also say 'Aint' sometimes in conversation but NEVER when writing a letter or a CV for a new job. Back to my 'Bubble'.
I am also back in my bubble. The system insists on its "gotten", our English teacher used to pull our ears if we used it. Duo: could you please kindly accept the differences between British an US-English? It is annoying, when an answer is marked as wrong, just because of that! Thank you!