You can see these randomly in a b & m and you see how fast this sold out online. There is no way there was near as many copies of this legendary edition as Halo 3. On the same note, shame on you for paying full price for this you my friend are not a true CAGer.
I bought my normal edition from TRU on release day with giftcard for 39 played the hell out of it got all acheviments traded it to Amazon for more than I paid. Waited till Amazon had Legendary for 75 and bought it half off, does that make me not a true CAger maybe, but I still paid half original retail.