Theda
The first place we went was Weasley's Wizard Wheezes. George had a separate room in the back where he collected all sorts of stuff for our pranks. It was actually thanks to him, in part, that we got started.
"Okay, so go in and look around. We just got a huge shipment of Peruvian Instant Darkness Powder, if you guys want to stock up on that."
"Do you have the dragon fireworks?" Harvey asked excitedly. George nodded.
"A few. They're pretty pricey though. What happened to the last one?"
"Um, well..." Harvey tried to look sheepish, but Kaytee and Roxanne ruined it for him by bursting out in hysterical giggles.
"What happened?" George asked, trying to look stern.
"Kaytee tripped over the box during the middle of the night and set it off." Harvey said between giggles. Kaytee gave him a death glare, and George chuckled.
"Bet Minerva loved waking up to that noise."
"Oh yeah, she was thrilled. No one ratted us out though, mostly cause everyone thought it was awesome."
"Well, if you guys want to cough up ten galleons you can have one, as long as you promise to take good care of him."
"How do you know it's a he? Hagrid said the females were more aggressive, and this one seemed pretty aggressive, at least judging by the fact that I could hear it in Ravenclaw Tower." I said, smirking.
"Well, it then. After all, it's not a real dragon." George said.
We ultimately decided not to get one, as Roxanne or Fred could easily get one for their birthday or Christmas. We left armed with a year's supply of darkness powder, fireworks in varying sizes, a dozen decoy detonators, twenty extendable ears, five of the skiving snackboxes and a handful of other things.