Below are some options for accommodations.  We've grouped them into three price-based categories.

LESS EXPENSIVE
Santa Rosa is 15 miles from the Beltane Ranch.  It's the largest city in wine country and should have many affordable places to stay.    

Vacation Rentals - Another great, money-saving option is to do a home rental. This is an especially good option if you can assemble a group to share the cost. There are several websites out there.  Stay Sonoma and Sonoma B&B are two good sites and Vacation Rentals by Owner has a number of listing in Sonoma County.

MID-RANGE
A lot of the Bed & Breakfasts in Sonoma and Glen Ellen are lovely.  They're also a bit cheaper than the hotels.

Sonoma Creek Inn - a small hotel in Sonoma.  Rates start around $180 a night. 

Trojan Horse Inn - a well-reviewed bed and breakfast in Sonoma that is just a few minutes down Hwy 12 from the venue.  Rates start around $195 a night. 

LUXURY
There is no shortage of high end places up in wine country.  A couple that are quite nice and close to the venue are:

Gaige House - a mid-sized luxury hotel in quaint downtown Glen Ellen.  It has a pool and is rumored to have a delicious breakfast. Rates start around $325 per night.  

Kenwood Inn - a large, Mediterranean style hotel that is just up the road from the Beltane Ranch.  They have several pools and a large spa. Please note that this is an adult-only hotel.  Rates start around $425 a night.