Life Cycles in the Library
Steve Spangler has some wonderful experiments on his website. He also has kits you can purchase with budget money or money raised from your book fairs.
The Texas Park & Wildlife has kits that can be used in the classroom.
PBS Kids has some great experiments on their website. I know science can be a little messy, but who says the experiments have to be done in the library? Talk a walk outside and do it. If you want, lay some plastic down inside the library and that should keep the carpet safe from any exploding liquids.
Many of our communities have master naturalists/gardeners. Many are more than willing to come out and talk to students. They can also help plan a garden to encourage wildlife to visit our schools.