You can buy tapered wood plugs at woodworking stores to fit common sizes of holes. I don't know if you'll find 1" though. You could buy some 1" hardwood dowel, sand a little taper on it, glue it in and sand it flush.
Other than that, individual floor boards can be replaced with some creative chisel work. Remove one board (several inches or so, otherwise it will look wierd). Cut the tongue off a new piece of hardwood and wood glue/fasten in place. Sand and finish.
thekctermite got it! A quick Google came up with both solutions.
Not sure about quantity. Hopefully you don't have to buy a bag of 50 or anything: http://www.widgetco.com/oak-face-gra...4Pa38Ta38Lbxj0
However, if it's not cost effective to get a single (or few) plugs, get yourself a scrap piece of hardwood. Hopefully you have some left over. Now get one of these drill bits in 1": http://www.jamestowndistributors.com...uct.do?pid=502
You'll create your own plug by boring out a section of the scrap wood with this. Now you have a plug that can be glued and pressed in. After it drys, sand or chisel flush.