I couldn't agree more, plan longer and do research .. Senegals although cheap can carry huge parasite loads as most are WC, without advanced knowledge of WC Chams and how to properly treat/acclimate you will have issues. Being in a hurry will cause issues in the long run, i have been breeding...
Avoid any Jackson under 5-6 months old if Chameleons are new to you, babies can be an issue for advanced keepers as well.. GL and hope you find what you want..