You can buy a window unit for less then $100.00 at Lowes, or Home Depot. Or you can get a portable one for about $300.00. Window units are easiest to use because the portable has to have an out let hose for the heat they generate.
We just bought a travel bassinet. Perfect for newborns and has wheels so we can bring it close to our bed at night and in the living room during the day. Never heard of a mini crib
that flexdex is a nice mini but you can ride on any mini and its not hard learning for a beginner i actually learned how to ride a mini before i could ride a normal size board