Collect the nets, sieves, containers, trays, etc. ahead of time. Disposable cameras were listed on the materials list. These are luxury items. The photographs would be used to enhance students' written observations and they fit well with the field guide idea. The recording may take a little longer, but there's definitely less expense.
Many students own a camera of their own.
Some teachers include camera film as one of the items to bring to school in the fall. Call for parent volunteers. The volunteers will help students as they collect data from the wetlands. The LCD digital camera is a relatively new form of technology that can be used as an instructional tool, as well as a creative learning tool. The camera is the size of a regular 35mm camera.