Any size is fine. You only need a small amount each feed so you may end up having lots left after the use by date with one chameleon if you get the bigger jar.
Plain calcium for every day
Calcium with D3 for twice a month
A multivitamin with no D3 for use twice a month also.
Zoomed reptisun calcium with no D and one with right? What else? And what size do you recommend? 3 oz or 8oz?
you want any brand mineral supplement that contains lots of calcium and no vitamins. This is what you will use most.
As well, a vitamin supplement that contains D3.
how often you use the vitamin supplement will depend on the brand you buy, the type of chameleon you have, how you gutload and what type of prey you offer
more info: https://www.chameleonforums.com/blogs/sandrachameleon/65-supplements.html