"His name's Scabbers and he's useless, he hardly ever wakes up. Percy got an owl from my dad for being made a prefect, but they couldn't aff -- I mean, I got Scabbers instead."
Ron's ears went pink. He seemed to think he'd said too much, because he went back to staring out of the window.
Harry didn't think there was anything wrong with not being able to afford an owl. After all, he'd never had any money in his life until a month ago, and he told Ron so, all about having to wear Dudley's old clothes and never getting proper birthday presents. This seemed to cheer Ron up.

Harry Potter and the Philosopher's Stone - Chapter 6 : The Journey from Platform Nine and Three-Quarters
See this quote in the Pensive -