Philippine endemics, mostly modest in size, and considerably more colorful than that description suggests. O. philippinus runs a deep orange that holds through adulthood, and the various blue forms out of the archipelago are genuinely blue rather than blue in photos.
Fossorial to semi-fossorial, moderately fast, old world in temperament without being at the extreme end. Reasonable animals to keep once you accept you will not see them constantly.
Philippine export is restricted, so the hobby runs on captive stock descended from older imports plus whatever moves through European channels. That keeps supply thin and prices firm, and it means locality-specific forms sometimes disappear from the market entirely for a year or two before reappearing. Availability is the constraint here, not price.