The idea of having someone ask Obi-Wan if he was the father of her children was something she didn't want to happen. Padme could picture the scene and it didn't really end well for either party and she had a suspicion that Anakin would probably get a little testy if he found out about that. So when he decided to go walk she gave him a nod and a smile and sat down with the sales person.
It didn't take as long as she thought to get everything done, but she was soon enough looking for Obi-Wan in the aisles with a scanner and a bag of stuff from registering. She spotted him and chuckled as he seemed to be studying what was in front of him, "Alright! We are all set to go. Find anything you think I should put on my list yet?"