When I went into the local Petsmart and saw Kelly I knew I wanted her. But with it being a spur of the moment purchase and the holidays nearing, I need to do something cheaper, especially since I was also buy a 10 Gallon tank kit with a divider for two of my other Bettas. So I ended up getting a large Critter Keeper for her when I couldn't find a smaller rectangular kit anywhere. I already had a filter, heater, light, and gravel to use on it from Castiel's previous set up (I hated the aquarium itself though, which is why I went for something else to put her in).
It works out great for her and she seems to really enjoy it.