Argon/CO2 bottle

Recently picked up a Lincoln 175 Mig welder and I was sickened by the prices of an Ar/CO2 bottle. Hoping someone has an extra old bottle laying around I can buy before I go blow $150 on one from the welding supply. Thanks.

you can get a 30lbs CO2 bottle for around $75 thats not so bad. But one of the cheaperways is to lease a cylinder for around $25 -$35 a year for a argon co2 mix depending on what size cylinder you need.