The actual medication is propoxyphene. Novo-Propoxyn is a Canadian brand name, it's called Darvon in the U.S. or Darvocet if it also has Tylenol in it.
You'd get a few type-ins, but there would also be trademark issues. Overture is just 28 without extension. (Propoxyphene has an Overture number of 8280 without extension).
$50-$100 to a reseller, but a single end-user (the Canadian company that makes it) might pay more (or might take you to court).