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You don't have to buy boosters. Complete the special events and get them for free. If you complete all 5 levels of the Space Dash, you begin the next level with 2x color bombs, 2x striped-wrapped and 3 extra moves. That gives a pretty good edge. There are other special events where you can earn boosters also such as the Daily Booster Wheel, Treat Calendar, Space Race and Candy Pet. You can also earn boosters by collecting Sugar Drops. There are lots of ways to earn free boosters.
mariapirelli, read the info about the Space Dash closely. It will help prevent you from losing your Space Dash boosters...http://candycrush.wikia.com/wiki/Space_Dash
...and with fully loaded Space Dash boosters plus an extra color bomb and striped-wrapped, 3509 can be beat. Probably didn't need the extras. I even played it a little sloppy...