Giantmicrobes.com has a pretty decent set of categories for their products - I like the organization. Also, they have started producing specialized human cells and small multicellular pests. Blog with educational suggestions: http://www.stemmom.org/2012/04/giant-menacing-microbes.html
A Drosophila melanogaster embryo using in situ hybridization to visualize mRNA expression of the gap gene giant (red) and the pair-rule gene even-skipped (blue), with Sytox Green (Invitrogen) used to localize nuclei. Specimen preparation and imaging by Cecelia Miles, Dr. Martin Kreitman's lab; projection and cover design by Dr. Vytas Bindokas; University of Chicago, USA.