One particular item that really irritates me is contact lens solution. I mean, come ON. $10 for Renu, or $2.50 for store brand? You can't tell me the name-brand is worth another $7.50. I wear 2-week disposables, so it's not like I need something that's going to preserve the integrity of the lens for years and years. Buying the expensive solution is, literally, throwing my money away.