Usually, we take a strip/pank from a less-conspicious part of the room, and switch them. For example, if there's a piece in a closet, we use it to switch with the one that's 'damaged'. That way, there's no loss. It's a little tricky as to how to do it. The easiest ones to replace are along the walls. You simply bang the face-finished nails through the floor and up comes the piece (assuming its tongue isn't nailed, but it may very well be depending how the floor was layed.) If it's NOT up against the wall, but a row or 2 away, you can remove the row or 2 and get to the damaged one, and go from there, in order to remove the piece. THEN, if it's like, in the middle of the floor or too far away from a wall, you have to 'ruin' the damaged piece, take it out, and insert a replacement from, say, the closet (as mentioned earlier.) The difference here is that you can't re-use the 'damaged' piece. That's OK as long as you don't care that some of the floor in the closet is 'missing'.
That's the way it is. Unless anyone else has any other ideas, my best to ya and hope this helps.
PS: If you were thinking of 'plugging' the hole, forget it. Wood in this type of situation will expand and contract at different rates, thus, possibly forcing the plug loose.