Thanks a bunch
This is another way to say "Thanks a lot", but it is usually used ironically, so you'd have to rely on context and intonation to be certain.
Thus, this is an expression that should be used carefully by English learners, if they get their intonation wrongly, they could easily be misunderstood. Straightforward phrases like "Thank you very much" also become sarcastic if said in a sarcastic tone, so pay attention to your pronunciation
Please supplement this topic.
I hope that helps.