So that leaves me still wondering which cup to covet. I know that everybody's different and I can't really give you enough information for you to make a specific suggestion, but I'm hoping you can help me narrow it down or at least find some criteria to choose by. Here's what I can give you: I'm 24, sexually active, with no children. I'm reasonable sure I have a longish vagina, as I don't normally feel my cervix at all, but I'll investigate a little more next time I hop in the shower (since I'm on the rag and it'll be messy). At my heaviest flow I need a few biggest-size tampons per day, generally only for a day or two per cycle, and then the rest is quite light. My reproductive system and I get along well (knock on wood); birth control pills keep me regular to within a day, cramps are rare, no unusual anatomy that I'm aware of, etc. so I'm not anticipating any difficulties. Oh, and I have PCOS, but I don't think there are any relevant symptoms.
I'm interested in a cup mostly because I can't afford tampons right now--which means I can't actually afford a cup either, but I'd rather have to scrabble for a little more money once than have to worry about it every month. Thus, any leads on discounts would be appreciated. (Hm, maybe I'll make a set of women's-health-themed pins to support this).
Edit: Just remembered another concern I had. I know that when used properly cups are supposed to be unnoticeable, but when I have occasionally had a tampon lower in my vagina than normal I find it obvious and distracting. This makes me worry about having a low-fitting cup. What makes it different?