Well I have a few that I like.
Sandcrawler, Cloud City Playset, B-Wing, Imperial Shuttle, Droids A-Wing & not to forget the Tatooine Skiff.

Well if you get one, here's another hidden song.
Credit goes to yakface.com for this:

So here is the Fifth Song Easter Egg for the Interactive R2D2, thanks to Wes for the input, as well as all the others.
Use these commands...
Behave Yourself
Speak Up
Speak Up

R2D2 will then play the Star Wars main theme.

Well I'll tell you, I read this & turn R2 on. I gave him the commands. Ha Ha, it works.
His head start's turning back & forth, his light beam is blinking & he does play the Star Wars theme. He even has a little clicks & his personal scream in it.

When you give him a command, you have to wait for him to respond before you give him another command & so forth.

Still working on other commands.

Movie.

I don't think you will find 12 backs in good condition for under $100. CDN.
My Jawa was $75 & C-3PO was $90. US.
I wish you luck.

Harryhausen.  

Harry.

Magical.

Well I finally got one.  
Cost me $103.05 but it was worth it.