You may want to look at www.scientificsonline.com or www.hometrainingtools.com both have tons of science stuff you can purchase. They've got chemistry sets, disection kits, water test kits, forensic science kits, and a lot of other stuff. The second one also has pages that give ideas for science projects and they have the science curriculum for many of the major curriculum providers (SOS, BJU, Apologia, Alpha Omega, etc) as well as the kits to go with the curriculum.
My oldest in only in 3rd grade, so I haven't planned what we'll be doing for high school science yet. I hope you find something helpful at one of those sites.