Ah yes, the town bicycle of dragon scales. Just about everybody's had one of these in their pockets at one time or another.
For those of you who are wondering why Ragefire is not listed as a source of red scales, it's because I'm not entirely convinced that he drops them, or any other dragon loot, anymore. I mean, now that he's triggerable, it seems only natural that all that nice uber stuff be removed from his loot table. I've been at 4 killings of Ragefire since he was turned into a triggered mob, and I've only ever seen him drop the heart for the cleric epic, and the bright orange armor.