Fairly comprehensive list, 225 listed. http://www.lasvegashappyhour.net/Most-Popular-Happy-Hours-in-Las-Vegas/page-1 Looks like it covers the entire Valley. Unfortunately, not all list prices.
There's a website gotime.com that lists happy hours for many cities. They even have an iPhone ap. My only gripe with these lists is they are not updated, so call before you go, lest you order two dozen oysters and it's not buck a shuck!
Society Cafe at the Encore has a happy hour special of $6.00 for for 6 lollipop chicken wings. They are great. I believe usually they are $12.00 for 10. 2 for 1 beers as well (and mojitos I believe). The bartender was making them non stop when we were there. I don't believe the hours on that website are accurate. I believe happy hour ends at 6:00 PM. They were some of the better wings I have eaten.
I LOVE those wings at Society Cafe. Thanks for the happy hour tip, JWBlue. I'll be heading there at the end of the month! The mac and cheese bites with truffle dipping sauce also rock. Now, I'm hungry. And thanks for bringing up a happy hour thread, Joe. Good stuff!