Okay, after I posted, I went off to make my own purchase, which I'd been meaning to do for a couple of months now. Found a great site that has the FitBall much cheaper - only $12! And shipping was much less than what I found at "birth" sites as well. So I got a ball, pump, and plug for $31 (including the $8 shipping). Other places wanted around $45 for the same (including shipping and handling).
So, head for this site if you're looking for something less expensive, good quality (medical), and actually for less $$ than someplace like Walmart.Allegro Medical