I think someone here recently told me 554's with plastic hookswitches are rare? $20 seems like a great price in case anyone here is interested.
https://www.kijiji.ca/v-art-collectibles/oshawa-durham-region/vintage-northern-electric-wall-telephone-new-price/1457636363 (https://www.kijiji.ca/v-art-collectibles/oshawa-durham-region/vintage-northern-electric-wall-telephone-new-price/1457636363)