You just missed one on ebay for $46 ?
From the website..
221.0223 Leaving Earth + Mercury $44.95
1 About 90-120 mins. Varies.
2 I play on a 3x4 tables. Fills it nicely.
3 Yes. but i added Outer Planets for even more variety.
If the $46 included shipping, it's not a bad deal.
I concur with the rest. I haven't cracked open the expansion yet, but my solo plays of the base game average about 80-90 minutes, and I typically play on a ~40" square table.
Edit: The eBay listing had ~$10 shipping. Better to just buy it new from Lumenaris at that point.