The following tools are not necessary but are all under five dollars and worth every penny!
Parchment Paper: Will always get you out of a sticky situation. I myself have jumped on the silpat bandwagon, but I do enough baking to justify the price tag. Parchment paper is tied and true and easier to clean too!
Egg separator: Separate egg yolk from whites in a jiffy! No tricky handling or waste and can hang on the rim of a bowl.
Non stick cooking spray: Aka Pam. Yes there are times you'll need both parchment paper and non stick cooking spray. Plus its always good to have in the kitchen even if you're not a baker.