I usually buy items under 160 euros from www.svb-marine.com
Shipping from Germany is only 25 euros and they deduct VAT from the listed price.
Items take generally 7 to 10 days to arrive.
This page has Jabsco manual and electric toilets, as well as parts:
- In English:
- In French : https://www.svb-marine.fr/fr/categorie/plomberie-wc-marins.html