if you had to get a plumber for an ro system how much would it cost to install?

any tips on water machines welcome it seems complicated

Do it yourself, the only tools you need are a holesaw if your putting a faucet in your skin, Drill, and a drill bit, The waterline is self piercing, and the drain just needs to get a hole tapped into the plastic and sits in a saddle. Its incredibly easy to install.

Takes a newbie 45 mins to install.

sink not skin lol, also if you get a plumber they are gonna charge you roughly 100-200$ save yourself some money.

find the unit you want installed and get a home repair guy to install it ,or a handy neighbor less than 75 bucks to install

Mine was installed by a real plumber for $75 and that was his minimum. If I had had some other things for him to do he would have to make an hour.