2" X .120" wall D.O.M. tube is often the minimum requirement for the main cage (for certain classes, check your handbook for tube size requirements!)
Tube is sold in 1 foot increments. Precut tubing is shipped by UPS Ground in lengths no longer than 6ft. Call in with a commercial shipping address for full stick pricing delivered (must have room to accept a large truck and have the means of unloading!). You get the most for your money ordering multiple sticks as shipping 1 stick (~20') is not much different than shipping for multiple sticks
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.