This year I am making them available again on Zazzle. (click to see them)
In addition I am selling them on Etsy (click to see them). The first one uploaded today.
The Zazzle ones are printed in the USA and therefore for North American buyers it makes sense to order from them to avoid any postage delays and customs duties.
The Etsy one instead are printed by myself here in London and therefore is recommended for UK and European buyers, again to avoid postage delays, VAT and customs duty.
Opera composers uploaded to Etsy today. It is already on Zazzle.