The Buy/Sell/Trade Forum on the JB Forum has seen many things come and go...mostly tools and supplies. And while we've been asked about old or discontinued tiles strangely often, there haven't been any sellers on this forum
Why? Probably because the forum consists mainly of DIY'ers and professional tilers. DIY'ers who have extra tiles will keep them for themselves...and pros have little interest in accumulating tons of misc tile. There are no commercial vendors of tile here, let alone old, discontinued tile.
But...there might be hope:
Use Google to search for your tile using as much of the name as you have.
Or go a slightly different route by typing in: "discontinued tile for sale"
. That will show you some businesses that specialize in this field.