Here's a Trail Cam that is really inexpensive. If you can hold out, ebay frequently has them around this price.
http://www.ebay.com/itm/Wildview-TK40-8MP-No-Glo-HD-Trail-Camera-w-IR-Flash-STC-WV40NG-/291569807924?hash=item43e2ea3234:g:lzEAAOSwYIhWk70I