UPDATE: Via Dan’s Deals, you can use Cash + Avios and get a very good value out of your Avios (around ~2 cents per Avios)
British Airways has been having on and off business class sales to Europe for the last year or so. According to FlyerTalk, the sale is back again. I’m finding fares to Europe from San Francisco to be around $2000. This offer is not limited to San Francisco though, and should be available from many airports across the country. It’s not too often that the West Coast gets business class deals this good to Europe though.