Jubel, you can gamble by buying Crate 30's for 5-6 keys and unboxing them. 1/5 of the time, you'll get a Gunslinger, and you'll make either no profit, or a little profit (I made a 1 key profit off of a s. gunslinger). 2/5 of the time, you'll get a Machina or Kritzkrieg, and you'll make a ~2-3 key profit. 2/5 of the time, you'll get a caber or a mackerel, and you'll lose money.