A bulb auger?
It's just an oversize drill bit. Attach it to a power drill and drill away. It's a bit difficult to use in wet clay soil.
Mine is an old one left behind by the previous owner of our house, but I've seen them at those big stores like HD, etc.

I made a set out of PVC tube. Each one is ~4' long, with the business end cut at an angle and sharpened with a file. The other end has two holes drilled and I slide a short length of rebar through for a handle. I just lean on it and twist it down to the proper depth. Then pull it back out, and it removes the plug of soil. Drop in the bulb, and replace the soil. I have 4 different diameters. They work best after rain, when the soil is moist.

Typically I use a big shovel and did trenches. I mass my bulbs and pack them in. Sometimes between perennials I use a trowel but I do prefer massed.

If you mean a bulb auger I got one at Lowe's they were sold by their bulbs a couple of months ago.