Yes pigs have a very good sense of smell the reason they started using dogs is because the pigs were smart enough to realize that the truffles actually tasted good and they had the very bad habit of eating the truffles themselves
I have found these rings online fairly cheap but I kept noticing something ... people kept mentioning using tuna cans, I guess this is my question ... how would you go about cutting off the bottom of the can and is it really worth the aggravation of doing it when the real deal is fairly cheap to begin with?
Find a local restaurant, not a chain and apply for a dish washer position and if you can handle that go in early a few days a week or just come in on a day off and ask the chef if you can help out off the clock.
When your talking about a disk bottomed pan are you talking about something like the allclad pans that have the big thick plate or what ever the heck it is on the bottom?
If so I have never really cared for the look of them, I have a 9.5" pan and a 2 qt. saute pan from Viking that I absolutely love ... they have the same thickness on the bottom and sides.