Serangoon North has a few pet shops that are very well stocked. I like to go to Happy Paws and Pets's kiosk pet salon or something like that. Block 154 I think. Prices are reasonable and if you buy all your pet supplies exceeding a certain sum, they will deliver to your house. oxbow is good, but at the moment i am using supa - the buns love them. also don't forget they need hay as well.