As a small child, I had a space shuttle toy that I absolutely adored. It had a launch pad and tower, a mechanical crawler, and separable solid rocket boosters and external tank. The shuttle itself even had a button that could jettison the external tank and boosters. To perpetually space-obsessed me, it was incredible. It was far more accurate than you'd expect from a toddler's toy. When I was 8 or 9, I decided to donate it to charity. I didn't really play with it much anymore and thought it was too awesome to sit unused in my room. I've never seen one since. Every once in awhile I search for it on eBay and Google but have yet to find it. The closest I've come is finding a picture of just the shuttle:
What I wouldn't give to have one again.
My grandparents had one of these for me! It was the best playset ever. The astronaut had a little jetpack he could wear, too.