I've got the tank, gravel and decorations already, but its the filter, heater, cleaning supplies, water balancers, food and storage that trips me up. The heater and filter I want I can only find online. Though I suppose waiting on the filter is a good idea - the one I'm looking at, the Marina S10 slim power filter, is relatively new doesn't have a lot of reviews for it, so no one's reported any problems with it yet. I'd hate to be the one to realise whether or not it sucks after a month's use. And of course, the balancers and food and stuff expire after a while, so I'd rather get those as close to needing them as possible, and everything else needs storage space.
I don't even want to take the tags and stuff off the decorations cuz I keep changing my mind as to what I want the tank to look like. lol. I was originally going to go with a black and blue Tron theme, cuz the betta I have my eye on right now looks like one of the programs in the original movie. ^^; but I couldn't find suitably colored material, so I shifted focus.