Book fair convener Helen Potter says the initiative is to get children to go to the sale, to get a book and to encourage their reading.
"They can find a rock and get a book - they don't have to pay for the book and they can keep the rock," she says.
The initiative was tried for the first time last year and was a successful addition to the annual sale. Of the 150 rocks that were hidden, 83 were taken to last year's sale.
All the rocks were painted by Lions club members
The rocks are being placed in Jubilee Park, including the skatepark, Maketū Village Green, McLoughlin Park, Fairhaven Park, Litt Park, Ben Keys Park, Donovan Park, Gordon St and around the Te Ara Kahikatea Pathway.
This will be the Kiwicoast Lions' 27th year of running a book fair and it is the club's major fundraiser.
Money has previously gone to Te Puke Junior Football Club, Te Puke Gymsport and the Graeme Dingle Foundation to be used for programmes in Te Puke schools as well as to help fund Spirit of Adventure experiences and assist Te Puke Scouts with building renovations.
Apart from books there will be magazines, CDs, DVDs, records, jigsaws and children's games for sale.