Wedding Chair Covers

I am looking to PURCHASE about 150 chair covers, however these are not the folding chair ones. They are for the chairs with a higher back and padded. I would much rather Purchase than rent. Where is the best place to get these at a reasonable cost. I can get them for about $5.00 each, and I am looking for something much cheaper. The hall will purchase them when my wedding is over. I am in Arizona!! My wedding is in March 2007 ~ Thank you!!