Grout float (Orleans)

I need to grout a few back splash tiles and was told to get a grout float (just learned what that is!). If anyone has one that they aren't using, I'd really appreciate one to keep or to borrow. It's a limited small job, so I'm hoping to keep the cost down. The picture is of the one recommended at the hardware store: 4" x 9.5" (it has moulded rubber & non-stick gum rubber, whatever that means!). Thanks if you can help.