Bearded dragon crickets?

Is it extremely harmful to feed my beardie bigger crickets than the space between his eyes? Reptar is about 6 and a half inches long and between his eyes is a half inch. The pet shop in town sells crickets for $4 but u only get like 20 and the cricket cup at walmart is $2 and u get around 50. The crickets are around 3/4inch from walmart. Is this terrible and should I spend the extra? I'm also feeding him meal worms and baby night crawlers. Thanks