Daggers are the fastest weapon type in the game and the rogue mainstay, so dagger demand renews with every rogue alt a realm levels.
Dagger (Weapon)
Auction-house prices and price history for Dagger in MoP Classic.
231 items in Weapons › Dagger are currently auctionable in Mists of Pandaria Classic.
Prices refresh daily from TradeSkillMaster (TSM), so day-to-day gaps in lower-volume listings are expected rather than a collection problem.
Dagger listings link to price-history pages with per-realm buyout, average, and median data for Mists of Pandaria Classic.