Best Russian chant site I've found is here:http://www.orthodoxmusic.ru
The site is in both English & Russian. You have to order from Russia, but the CDs are quality. Quality of performance, production, packaging, etc. Even with shipping from Russia, a single CD typically runs about US $12.
Their staff is courteous and very helpful. They can help you navigate international buying. If anybody is interested, PM me or respond back here and I can give you a few pointers about how to speed things along with them when ordering. Their English isn't too good, but it is sufficient. They ship very quickly. I ordered 7 CDs and received them in two weeks.