I know it's a bit over $40, and I'm a dude (fyi) but I've heard a lot of good things from the ladies on this one.
As /u/LadyOfCastamere (awesome reference, by the way!) said, $40 is probably your lower limit. I prefer to keep recommendations to things I feel confidant someone will like, hence the above. Good luck, though!
*Edit: Forgot a . Also fixed link because I realized the one I linked was a knock-off.
Ladies...
I recently had the HV-260 bought for me off Amazon (http://www.amazon.com/Magic-Wand-Original-Hv-260-Model/dp/B00D433KC0). It's still made by the same people, but Hitachi just unbranded it. I enjoy it greatly, but it's not exactly the most sensual thing. It's like "ok, i need a 1 minute orgasm through my clothes before my friends show up." or "I edged myself too long and now can't climax without bringing in the big guns".