I do believe it is no longer being produced but I'm not 100% sure of that.
That being said I used to see it on all the major discount sites frequently. I don't know if that is still true but I'd check there and there are some ebay resellers who have pretty extensive inventories and they might have it.
Cumming was an interesting stab at an unusual mass-market men's fragrance. I liked it and am sorry it didn't sell better.