My choice to consider the genus Trioceros, this genus has got some great species that would work out great for smaller terrariums. If you make it past the parasites, rough handling from the country of origin you have a shot at a great import or you could look for a breeder and just buy captive bred. Off the top of my head there is Trioceros affinis, bitaeniatus, montium, cristatus, perreti, serratus, sternfeldi, and pfefferi plus many more species from that genus fit your description in the genus Trioceros if you research a bit or send me a pm. That is some smaller species from one genus and there are other species from that genus plus plenty others from other genera. Then there is the dwarf chameleons (not normally chameleon I keep) genera Bradypodion, Brookesia, Rhampholeon, Rieppeleon, and Palleon all these species could be kept. I recommend trying to narrow down your search to what genus or two you want keep first then decide. That is my guidance.
Best Regards
Jeremy A. Rich