Thank you for the insanely quick reply.
Can't believe you get refreshes which allow you to sell magnets, usually I can't really sell anything above 8000...
Also, it's worth keeping the insulator for the 1st free roll for the following day as it can get you around 69 stamps per drop (with a much higher chance than the 2nd) just a tip from an old guide on the game's wiki
 "Project Restoration"){kind=icon}