Last year tickets through the councils/ski clubs ran from a low of $41 for Pico to $68 for Okemo. Most of the major resorts were in the $60 range with Sugarbush being $63 & Stowe being $66. These tickets are good any day (including peak holidays) not just for specific dates. You do not have to pick a date you want to use them beforehand. You do have to be a member of a ski club & be able to prove it with either a current date on your club card or a current council sticker attached in order to use them as most areas do check.
If you take this route, I'd put Stowe back on the map for options. The one major hangup about Stowe is price, otherwise it has everything else you're looking for.