I recently got a set of jigsaw bits and a cordless jigsaw. The $25 was a lot more appealing than $300+. E.g., https://www.amazon.com/gp/product/B07WPSTHRW/, https://www.mobilitybit.com/, etc. The jigsaw has other uses, assuming this doesn’t destroy it. 🙂 So far, it’s just another tool in the mobility & self myofascial release toolkit.
The most useful things I have are the Rogue 80mm SuperNova and Travell & Simons’ books on myofacial pain and dysfunction. Calf tightness might be referred from a knot in glute minimus, for instance (see image below). Jill Miller / The Roll Model book and foam balls are also great. No affiliation, just my opinion.