"Let's call our nearby parishes and see if they'll sell us an indulgence or two.
Shall we?"
Go for it!
If one does, tell us all!
Indeed, if one does, you will have demonstrated a fatal flaw in the Catholic Church and gone a long way towards proving your argument, even to Catholics.
Go try to buy an indulgence!
Please!
(I dare you!)
It took you three hours to come back with that? Do you doubt you could walk into your parish and pay for an indulgence? How about Prayer Cards? Bought any of those lately? Paid for a mass to be said in someone's name?
Are you saying that the selling of indulgences is error?