US Airways and Sun Country are showing BOS-LAX one-stop one-ways for $243. The non-stops jump to over $400.
If you could pry yourself out Saturday, or wait until Monday, I see $225s.
I'd definitely not go without my return booked, but people do have different tolerance for risk.
Speaking of risk, you could try your luck bidding on Priceline. You won't have a choice of airline and schedule, but might be able to score a deal.
Romelle