For those not familiar, Massdrop is a site where they put up a deal (called a drop). The drop is active for a week or two (8 days for this one) and as more users pledge for the drop the price comes down. After the drop ends Massdrop puts in a bulk order from the manufacturer and then ships the units out once they receive them. This process usually takes up to a month from the end of the drop. For those that don't want their game in a hurry the savings can be worth the wait. In this case, Eclipse appears to be about $10 cheaper with shipping factored in than buying today on Amazon.
Currently the deal is $50 + shipping but it'll most assuredly drop to the lower $45. The limit on this drop appears to be 100 units.