Definitely www.zimride.com. If you want a referral to that site that will get you a $20 refund if you use it, PM me with your email address. I've used Zimride a bunch this season. It works great. You find a ride that matches, confirm details, then book it. You pay with a CC and the driver gets a paypal transfer the next day. If I were sticking around past the weekend, I'd offer you a ride.
The other place to check is the Reno Craigslist page under rideshare. However, if you post a ride needed on Zimride, it offers a button that auto-creates the post on CL for you. If all else fails, you can always take a bus/train, but that will cost a bit more and involve some transfers via BART to the airport.
For cheap lodging, check out the Holiday Inn Express in Truckee or any of the other cheap hotels. You could hitchhike from Holiday Inn to Squaw in about 1/2 hour or take TART (bus). There's also Granlibakken and a couple other places in Tahoe City. Most have shuttles, access to TART, or are a stop for the Squaw shuttle.