I don't have Song, but I do have a Resinsoul Mei, Gang, Ai and a Bobobie Weylin. Weylin and Gang were bought second hand but I ordered Ai direct from Resinsoul and their customer service was amazing. The wait was long, but worth it.
I ordered my Mei from Denver Doll Emporium, and the wait was 2 days, lol. They keep lots of things in stock and ship same day, usually. If you order from them, be sure to pick something that's actually listed as "IN STOCK" or you'll be in for a long wait, haha.
http://www.denverdoll.com/bobobie45.php