Replying to Kids Gear

Hey man I kinda of have a general questions for all you jabronis out there. I got 3 kids.........got my oldest one (9) a full set up and my middle kid (6) armadas and armada bindings whatever the fuck those are and now I'm looking for boots for her, and then we have my 2 year old son who is JR sized but will be 3 on New Year's Eve. Probably will be the size of a average 2 year old when he turns 3. Only got his outerwear set. I am absolutely amazed by the crazy price of toddler ski shit and also the lack of decent used equipment on the market to buy for that age but man I have no idea what brands or any of that to look at. Does anyone have any brands of skis/boots/bindings that they really like price wise and quality wise for basically 2-6 year olds. Kind of amazed at how little is out there to be honest.