Videomaker – Learn video production and editing, camera reviews › Forums › Videomaker › Feedback › In Need of a cheap audio and video mixer › Danny: Check out http://www
Danny: Check out http://www.bhphotovideo.com/c/product/307324-REG/Edirol_Roland_V_4_V_4_Four_Channel_Video.html at B&H in New York. It's about $1300, the least expensive video mixer (SD, not HD) I've been able to locate for you. HD mixers appear to begin around $9500 and run to $17000 or more.
Check out B&H yourself for inexpensive audio mixers. There are a great many to be had.