If it crosses your mind - next time you see it happening throw me a line! I swear I must just go in to the store with blinders on. "Cat food - IN AND OUT" paying attention to nothing else!I believe it's a national sale. I'm in Wisconsin and I've bought 4 20GL from them in the last 6 months.
Why not check their website, or become a Petco member (it's free, and if there's a discount going on, it will be applied to your purchase when they scan the card)? At least here, they send out mailers regarding upcoming sales to members. Heck, they might even put them in the daily newspaper on Tuesdays or Fridays (days when our dailies seem to put separate ads in our papers).