[Alan Brinton]

Welcome, Maria. It’s exciting to hear your enthusiasm for the melodica. Good selection of models. The Hammond 44 mouthpiece is a Suzuki part and is available from Japan from Rakuten Global for about $21 plus shipping (probably $10-12). It’s worth it. It fits all the other current and recent Suzuki Melodions.

http://global.rakuten.com/en/store/westmusic/item/4939334118623/

I’m pretty sure this cheap mouthpiece would fit your Hohner: