I have been trying to learn the halachot of k'tivat sta"m, however, I am still looking for the relevant sefarim, seeing as the ones on Hebrewbooks.org are mostly illegible. One sefer that I've noticed is Likut Sifrey Sta"m. Does anyone know how good this sefer is? Is the type clear? The illustrations? Are there any alternatives which are likely a better choice?
On talking with a sofer in the NY area, I was advised to wait on this sefer and to look instead at Mishnat Hasofer. Does anyone know if it's possible to find this for under $30US?