Amazon has these on sale right now for $15-$17 each. They are normally $20 a pop. With Amazon's sale, they're still $64.43 for all 4, plus any applicable shipping (if you're not a Prime member). You still save about $10 going with this deal, even with shipping.
On a different note, my cousin's kids have these and they are so much fun! My daughter really enjoyed playing with these when she was about a year old, and I didn't have to worry about her choking if she put them in her mouth. The small pieces were small, but not so small that she would choke on them. I've always wanted to get her some, but because of the cost, I've always hesitated. Definitely will be seriously discussing this with the husband for birthday presents this year!