During its heyday, Pablo Escobar's drug cartel spent $2,500 per month on rubber bands for bricks of cash. Mental Floss has a interesting profile of the drug lord.
The profits were astronomical at every step. In 1978 each kilo probably cost Escobar $2,000 but sold to Lehder and Jung for $22,000, clearing Escobar $20,000 per kilo. In the next stage they transported an average of 400 kilos to south Florida (incurring some additional expenses in hush money for local airport authorities) where mid-level dealers paid a wholesale price of $60,000 per kilo; thus in 1978 each 400-kilo load earned Escobar $8 million and Lehder, Ochoa, and Jung $5 million each in profits. Of course the mid-level dealers did just fine: after cutting the drug with baking soda each shipment retailed on the street for $210 million, almost ten times what they paid for it.
Soon Lehder was hiring American pilots to fly a steady stream of cocaine into the U.S., paying them $400,000 per trip. At one trip per week, in 1978 this translated into wholesale revenues of $1.3 billion and profits of $1 billion.