the cheapest pledge to get the full game and alpha / beta access is $40. from the main page, click on the giant "learn more" button and select the digital mercenary. or, for $45 you can go here and get the advanced starter pack. it comes with a better equipped aurora (lx variant; standard is marque), but doesn't include the 1,000 starting credits.
if you're just interested in the online universe part of the game, and not the wing-commander style squadron 42 part of the game, you can get the starter pack for $35 (which includes alpha / beta access). frankly i don't think it's a good move, as the squadron 42 campaign is going to kick ass lol. but hey, some people don't like single player games...
I do. The single player is what I want first and foremost. So $40 huh? Ok.