If you bought them at lowes that many years ago they were probably by TileCera which is Now Florim USA in Clarksville Tennessee.
If not they may have been from Midland Tile Works
Laufen use to make a product called Charleston Black.
And Summitville Tile also had a look like what you have
I do not know of anyone who may be presently making a tile like yours
it is possible you could find any of these three at a closeout broker like Stovers in Cookville Tn www.Stovers.com Tile mart in Michigan and Indiana www.tilemart.com The Tile Guy