Hi Janet,
I took a look at mine. Turns out I have both a Microtach and a Microstitch. They look identical, except that one is red and the other is green. They they both work the same and use the same needle and nylon micro fasteners. Refill #11186. I bought my Microtach years ago. I bought the Microstitch at AC Moore to have a spare. I use both now. I load one with black nylon fasteners to use on light fabric, and I load the other with white fasteners to use on dark fabrics.
I see online that Microtach comes with 2 needle sizes. Both needles are the same diameter, but one is longer than the other. I have the short needles in both of mine. I would be afraid the longer needle would not hold as snug and the quilt layers would shift. I think the Microtach with longer needles might be more for commercial use.
I think all the different basting methods have their advantages and disadvantages. I like this one because I have carpal tunnel. Pin-basting is way too painful. I like spray-basting also, but only outside. I mostly make large bed quilts and I don't relish spray-basting on my deck in the cold.
I like being able to free-motion anywhere I want without being restricted by pins.
You asked what AC Moore sells. AC Moore sells arts and craft supplies; fine art, scrapbooking, cake decorating, floral, children's arts and crafts, yarns, knitting, and a selection of sewing/quilting notions.