Wtb: DDR4 ram 16gb 2133 or 2400

[Killerxp100]

I'm building a modest PC for an elderly couple's grandchild using a Ryzen 1300. Looking for the cheapest ram I can find, don't care about the speed or configuration, could be 4x4gb or a single 16gb stick ect. I'm already over their budget slightly so cheaper the better.

Thanks to all!