It's been a while! I forget where you buy Luminaire ornaments. Are they sold in a main shop, or.....?

You can buy them from user shops (I bet there is a huge list on subetalodge?), or you can buy an from Melodys Cottage after you get the daily items. It costs 2000 sP and contains up to six random ornaments :)

you can an old box of ornaments from melody by 'donating' 2000 sP every 10 minutes after you've collected her gift for the day. opening the box will give you 3-6 random ornaments.

Thank you guys! It would have taken me all month to figure that out. Mucho apreciado <3