I work for Petco and I am pretty sure unless something changes they will never do this again. They just recently had another one and it was for 29 gallon tanks and under.
This is how they saw this sale the first couple times around:
Customer comes in sees the great tank deal and gets the stand and filter and everything else as well and they make a profit.
Great idea from their pov..
This is how it actually went:
"Holy bleep Petco is having a huge sale! I'm going to just buy a couple tanks at this great deal and not their overpriced stands and products!" lol
needless to say they lost a ton of money and re-thought it on this last sale and I doubt it will go back.