Thomann has them for EUR 19,50: https://www.thomann.de/de/elixir_nanoweb_baritone_8_string.htm...the Elixir Baritone 8string set (here in Germany over 30€; i.e. 36 $)
I own the Alvarez 6 string Baritone and I really like it for finger style playing but its not good for strumming. I plan on getting the 8 string Guild Baritone for strumming and plan on keeping both.I own the Alvarez 6 string Baritone. It is a good guitar for what it is.
I am very interested in the new Guild 8 string Baritone though.
May be selling the Alvarez soon.
I've actually been doing that for years on a lesser scale by always subbing an .025 G string into D'Addario's Ej-16 set, to replicate the actual gauges in Guild's L-350 lights my dreads came with. Those were D'A, too, and they still offer the appropriate PB025 single so the alloy matches too.Needing to build a custom set each time you change strings would take some of the fun out of the guitar.