There is no ONE cheapest place, best is to keep your eyes peeled and look around.
Prices changes, in some cases on a daily basis.
Tip 1: Keep looking everywhere you can
Make sure to check
The Trading Outlet
other online stores
Tip 2: use different Keywords
While shopping on line use different key words for your searches
Even if the word do not sound relivant. Not all sellers use the same key words for there sales/ meta tag links
Mad Catz, Arcade Stick, Fight Stick, Joystick, Xbox, Xbox 360, PS3, PlayStation 3, Hori, TE, Tournament Edition, Street Fighter, Marvel vs Capcom
You not believe how many Arcade sticks listed for Street Fighter, Mortal Kombat, Blazblue and Marvel vs Capcom (and so on), even sticks that have nothing to do with those game series.
Its the same old logic 5 years ago that Pokemon, Britney Spears and Porn all produce the same results on some search engines.