| Collectology.com | | Offers specimens and gear for biological, paleontological, and geological collecting. Also offers appraisal services. |
| Discovery Scope | | Scopes for magnifying small objects. Site includes accessories and t-shirts for sale, also. |
| Efston Science | | Science and astronomy superstore, with a wide variety of equipment and supplies for sale. |
| Electro-Chem-Technic | | Makes and sells a novel small fuel cell, and offers hydrogen sources, accessories and materials for self-assembling. Based in the UK. |
| Enerdyne | | Optics, toys, garden products, Petoskey stones from Michigan. |
| Exploratorium Museum Store | | Science toys and games, puzzles, gifts, books, classroom resources, charts and posters, videos, and software. |
| Explore | | Includes dinosaurs, flying toys, gyroscopes, astronomy, boats, globes, and solar kits. |
| Geographics | | Purveyors of decadence in academia, T-shirts, bumper stickers, and other paleontology and science-themed materials. |
| Omni Optical | | Optical science, prisms, illusions, fiber optics, microscope, telescopes, optical science activity kits, magnifiers and binoculars are a few of the items offered. |
| Polarization | | Everything polarized, from variable sunglasses to science kits. |
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