Mr. Mustard: There is only 1 place you’ll ever need to deal with:- Tefillin Beth El; They are simply wonderful, impeccable Kashrus standard, and very courteous & easy to deal with.
When I was in Israel during the 1980’s, The Rabbonim at my Yeshiva recommended me to go there, and I have been dealing with them ever since, including all of my sons’ Bar-Mitzwah Tefillin.
I used to go in person, but with the advancement of technology, you can do everything with them over their website.