Signal Cable Silver Resolution is thin and high-quality for the price. Not sure exactly what you consider "thin", but you could also try some 12-gauge Belden from Blue Jeans Cables. They do pretty nice terminations too.
Thin, Flexible & Inexpensive Speaker Cables?
I'm looking for flexible, thin and inexpensive (<$300) speaker cables. DNM comes to mind but hard to find other than ordering directly from UK. I've ruled out Morrow SP1/SP2 (lead time's really long right now). Audience Ohno - tried it, didn't care for it. Maybe the classic DH Labs T14? Elf Cables are great but he's non-responsive. Suggestions? Or drop me a line if you have something you'd want to sell ...