If you are looking for common sets of strings, say 145 and under, you can actually purchase packs of strings direct from Ernie Ball. You can buy custom sets of strings from LaBella and String Joy directly. You can get custom DR strings through a local and willing retailer.
A company like Kalium is best for oversized strings, if you can handle the wait. I got my first set of strings from Octave 4 Plus. These are custom hand made strings by a guy working out of his workshop. It took 10 weeks. But, I could contact and get a response from them within a day. Plus, I could get a true custom set of .280, .210, .160, .120, .090, .065, .050. I'm having them put on my Conklin GT7. Ill have something to show and say once they are set up.
A company like Kalium is best for oversized strings, if you can handle the wait. I got my first set of strings from Octave 4 Plus. These are custom hand made strings by a guy working out of his workshop. It took 10 weeks. But, I could contact and get a response from them within a day. Plus, I could get a true custom set of .280, .210, .160, .120, .090, .065, .050. I'm having them put on my Conklin GT7. Ill have something to show and say once they are set up.