I've written a couple of posts about Jack's Big Music Show already, and though I'm not obsessed, I am into it probably more than I should be. Fortunately that's still not more than my little girl is into it, which is a good thing (I think).
Anyway, from looking at the comments in my posts, it seems a lot of people are looking for JBMS toys to give this year. Unfortunately, there aren't any. I can't imagine a scenario where they'll never start making the toys (since the show is now also on Nick Jr. and looks like it's a hit), but they're just not available now.
About the best you can do this year is get the CDs from some of the artists who play music on the show, which isn't as good as a plush Mel the Dog, but it's better than nothing. Music for Little People.com has a collection of CDs for $45.44, or you can always get them individually from Amazon.
Laruie Berkner Band - Under A Shady Tree (many of the songs featured on JBMS are from Laurie Berkner)
Rebecca Frezza - Road Trip
Music for Aardvarks - Grumpy
Milkshake - Happy Songs
The Dirty Sock Funtime Band - Mr. Clown and the Day the Sun Got Wet (from CD Baby.com)
Lisa Loeb and Elizabeth Mitchell - Catch the Moon
The Persuasions - On the Good Ship Lollipop (includes the song "I'm So Glad I've Got Skin")