Not all JoAnns carry the Singer lube any more. I picked up the last tubes the two old JoAnns had before they closed them last year. The new bigger store here doesn't carry it any more. I've found it on line at Sew-Classic so it's still out there.
Also be aware that one of the most recent tubes of the Singer Lube I have has white grease in rather than the original clearish to amber looking stuff. The others are normal. I don't know if it's real Singer lube, or if the maker is slipping in lithium grease, or if it was just a mistake and the wrong grease got in the tube.
Joe