To make supplementing easier, I use Repashy Calcium Plus, as does the breeder I got my guy from. Some choose to add a calcium d3 supplement bi monthly. This supplement is easy to use, just a dash in a cup and swirl your feeders about in it to get them lightly coated (not caked!). A few I have read about aren't entirely satisfied with the product; that being said I emphasize on the word "few". There is an incredible blog created in regards to chameleon care on this forum that address chameleon care specifics and even addresses the needs of specific breeds. Its incredibly informative & I definately recommend reading it. Additionally, other feeders can be ordered online. Silkworms are another insect that can be offered as another staple (variation is best). Mulberry Farms offers the and you can purchase a powder version of silkworm food from them as well; they are high in calcium & very easy to care for.