Well if you look up there
in the top corner, Purrs has its own shop where you'll find all sorts of goodies. Click on the banner.
The operator is the Purrs forum owner, our Tan.
Then there's a good few on-line stores like Zooplus (get membership for discounts), Animed Direct (free delivery), Bestpet (free delivery) and VetUK (great for meds) that are open to the public, you'll find your way around I'm sure. Pets At Home also sell on-line but I find their prices less competitive and delivery expensive. Be sure, though, that just sometimes, the best bargains are still on Amazon or E-bay
There's a section on here for best bargains, keep an eye on there for the latest posts for food and other offers (as this is predominantly a rescue site, our rescues are REALLY hot for bargains - so if you find one, post it!)
I won't flood you with stuff right now, but do have a wander around the forum. Especially useful are the health and behaviour guides - there's a section on just about every topic, written by experts and referred to by us all from time to time.