Discounts for park tickets

[Bembol_Rocco]

Has anyone experienced any discounts for park tickets through companies/vendors such as AAA?

And would buying tickets at other vendors (besides buying them at the gate or on Disney online or Undercover Tourist) guarantee a legit ticket?

 

[Safari Queen]

I purchased tickets from Undercover Tourist and they were fine. Also got discounted tickets for Busch Gardens from AAA.