I don't have a bargain site to hit, but my suggestion is to try calling around to some of the bigger music stores to see what they may have.
I picked up an inexpensive MIJ Strat a couple of days ago from a Music Go Round in WI, that won't have a case. I e-mailed my local guitar shop (
www.davesguitar.com) to see if they had any used Fender cases lying around. They hooked me up with an almost new molded Fender case, just like the one pictured...for $59. I realize it's a shot in the dark, but what the heck. As always, it's being in the right place at the right time.
I'd give the boys over at Dave's Guitar Shop in La Crosse a call to see if they have any similar bass cases lying around.