Fisher Price Sesame Street Tummy Time Pals $3 (free ship site to store!)
(Target has these for $10.99 and Amazon is $9.99)
Sesame Street Tummy Time Pals include five favorite characters to stack: BB, Cookie, Elmo, Ernie and Abby. The characters stack with interlocking connection in size order. Each figure can also stand on its own, and each makes a great playtime companion for baby. 18 months to 3 years
At $3 you can't miss. I bought mine. Great Christmas gift!