I don't have a good source for shavings here. A bale of straw costs me $4 and is good for more than a month, additionally i have hay from my pasture. Pine shavings are not always available here mostly the stores carry cedar-shavings - know poisonous - and those are expensive. I literally do the same thing: remove the big accidents with a hay-fork, fluff up the rest and add some fresh stuff. So far my duckies love it!