Yup, they are harder than gold dust to find - a while back went on a mission to buy as many as we could from anywhere in the world & struggled to just find a couple.
What may be an option for the original poster is to get the QUATTRO LNB prime focus and a multi-switch unit
which can then give you (for example) 8 output ports.
The downside being you need a multi-switch, an extra piece of equipment, as well as the Quattro LNB - but will give you more ports/backups or allow additional connections for yourself / neighbours.
Above is the proper way to do this - you can bodge an offset Quad LNB, but outputs can be variable on certain frequencies & will be lower than a prime focus LNB, which is designed for this dish type.