I have the small boxed set, but I did see something online that advertised their full original output (not including the new movies). I never looked into it more as I figured it would be more expensive than I was willing to pay.
If you want the 21 disc set it is available in the UK for around £40. Try checking Amazon.co.uk rather than .com and check the prices there rather than splashing $180 on it.
Awesome recommendation on suggesting .co.uk rather than the .com! I didn't think of that and just saw the $180 price tag and thought, "Screw that" but these prices are much better.
There appears to be two separate versions, one put out in 2006 and one in 2013. Interestingly the 2013 one is about half the price. Any idea what the differences are? I tried reading some reviews, but none made it clear. I would assume that the 2013 version is just the same discs in a less elaborate container without some of the other physical items the original set may have. However, I could be wrong.