Redirect after Order Confirmation based on purchase

Hi there!

I was wondering if someone could help me figure out how to redirect to a different page after an order confirmation, just for one certain product that is always sold on it's own.

I've read all of the other threads on this subject, and in the one posted above, it is eluded to that you can redirect based on the price (which allows the site to differentiate the purchase maybe), but it is not explained how this is done.

I would greatly appreciate any help! Thanks so much!