Very hard levels! Where are the boosters?

Really enjoy this game but .... Very vey hard! I am finally up to the 296 level but been very difficult to get there. Where are the boosters? All other games have ways to earn or buy boosters. And I shouldnt have to sign into Facebook to receive any. Come on! Lighten up!

sndwells about Scrubby Dubby Saga, v1.19.0