1 free (of charge)

1 shipping included

1 to waste

2 to squander

1 to consume

2 to spend

1 call charge

1 to take a lot of trouble (idiom); painstaking

2 at the cost of a lot of effort

1 to whistle down the wind

2 to waste one's breath (idiom)

1 to think oneself to exhaustion (idiom)

1 arduous and thankless task (idiom); strenuous and unrewarding

1 to rack one's brains (idiom); to take great pains to think sth through