I don't think there is any ninja that's cheaper then garra (recharge version) that is as good as him, ninjas like guy turtle and shisui uchiha cost 10-14k ingots/coupons when they were first released so not exactly cheapest, I don't know about any ninja that costs 1-5$ like garra. also some of the ninjas you mentioned are very overpowered like kaguya and 10 tails jubii so if they do get released they will be in the super rare tier at least costing over 20-40k ingots.