Its a bi annual thing IIRC. and most all stores honor the sale. however last time thru I noticed that none of my local stores bothered to get any decent tanks in stock leading up to the sale. So all that was avalible were a few standard 50 gallons and small tanks. Also the sale only includes tanks 55gal or smaller. Tho that does mean that their expensive 54gal corner tank is included in this sale, Most of the stores don't carry that one in stock. As well I think the bowfronts are excluded from the sale at any size and of course 10gal and under are also excluded. since the 10 gals are normally priced at around 11 bucks anyways so thats not such a big deal.
Stands on the other hand are expected to be jacked up in price to make up for the losses on the tanks.