Micheal,
Just buy them all. You know your going to need them in the future
Start stocking up now. If there's any you don't want just ship them to me. I don't mind.

I just picked up a 30 gal. long with 3 different lids, heat mat, rocks, filter and a light for $20 I don't need the filter but it's nice to have in case the need arises. Craigslist to the rescue.