Another option would be to build one. There are some pretty simple to reproduce designs out there now. WA5VJB's "Cheap Yagis" are legendary - see http://www.wa5vjb.com/yagi-pdf/cheapyagi.pdf . I've got a couple of designs at http://www.qsl.net/ve3sma/222MHzYagisWithDirect50ohmFeed.ppt . 73, Steve VE3SMA