Can I use a shorter belt to bypass the AC Compressor?

There is not an A/C bypass pulley listed for your Focus. to determine the length of the shorter belt you would need remove your belt and then measure around all the pulleys except the A/C pulley with a tailors tape to get the length of the new shorter belt.I don't know who gave you that price,but these A/C people seem to get real hungry when HOT weather gets here! If you can find someone at a trusted,local,independent A/C repair shop or even better to have a friend to help you do this job,you can buy the A/C Compressor & Component Kit with >A/C Compressor] w/ Clutch>A/C Receiver Drier / Accumulator] Filter Drier>and the A/C Expansion Valve for around $320.00. check out Rockauto.com,they only charge a very small shipping fee(bout $15.00 for this kit) and no sales tax! This exact same kit,made by the same exact mfg.( 4Seasons) is $530.00 at Autozone!