For very wide-angle astrophotography, especially around 10mm, you may not need an expensive commercial tracker. A barn door tracker is a common low-cost solution and is often good enough for basic Milky Way imaging.

It’s a simple DIY tracking platform that can be built from inexpensive parts, and very basic versions can even be operated manually by turning a crank at regular intervals. At 10mm, the field of view is wide enough that this crude approach can still work reasonably well.

So yes, for your stated goal, there is a cheaper path than buying a dedicated $300–$900 tracker. If you later move to longer focal lengths, accuracy becomes more important and a sturdier commercial tracker may make more sense, but for getting started with wide-angle night sky shots, a barn door tracker is a practical option.