I want to buy a camera that is $150 or cheaper that can record 30 minute videos. Any suggestions?

My Fujifilm Finepix F10 will record video until the memory card is full. It's only $120 if you get a good deal. Unfortunately for you, it uses xD cards which only go up to 2GB so it can do about 27 minutes at 640x480@30fps. If you set it to lower resolution you could go longer.

One second of 640x480 30 frames per seconds video will take up 1-2 Mbytes. Even you can shoot 30 mins, you will end up with a huge file.

You need to look at digital video camers,do you have a craigslist.org for your city/area? If you do,go there and look thru the camera section,A good digital video camera that will record the lenth you want will cost around $350 and up new,so try craigslist.org/your city and check the cameras section and electronics section.

How about one of these camcorders? Or check ebay or garage sales for used ones.