I just got mine on Amazon. This is a good option.
Ultima 6 Piece Colorful Seam Ripper/Nipper Set w/Carry case - 4 Stitch Rippers (2 Large & 2 Small), 1 Metal Nipper/Clipper, 1 Nipper/Clipper Plus Bonus Carry Case. https://www.amazon.com/dp/B07HY72KC5/ref=cm_sw_r_cp_api_i_tjcXEb4XD4WFK
But they do have them at the AC Moore, Michaels, Joann fabrics and Walmart. Fritz is a good brand. DMC as well. It’s not really too important. I lose mine frequently and have about 4.