Domo Music Group is having a Fourth of July sale. Domo is Kitaro's publisher -- and they handle other artists as well. Single CDs, DVDs and album downloads are $4; Double discs and album downloads are $8. I don't know if these prices are US-only. Purchases are handled by "payloadz." Don't let the "z" bother you -- they're legit.
I'm a fan of Kitaro's music and I thought I'd pass it along.
http://www.domomusicgroup.com/store/