PETCO has an offer for orders over $50 you order online and pickup in store you get 25% off.

I needed a filter and some other stuff yesterday and came in handy. I tried to buy it on my phone while in the store but it didn't work. Not sure if it was a glitch or they use the location data and knew I was in the store. I placed the order at home and it was ready to pickup in 30 minutes.