Zzounds doesn't just sell pro audio. I'm assuming some people that would be interested in reading music reviews COULD also be interested in playing music and could be hobbyists or wannabe musicians.
zZounds has personal keyboards starting at 49.95
http://www.zzounds.com/prodsearch?q=...er&form=search
And things like this stater guitar package for under 100:
"Ibanez IJV50 Jumpstart Acoustic Guitar Package
Includes: guitar, tuner, strap, gig bag, and pouch."
http://www.zzounds.com/item--IBAIJV50
You know your propsed audience better than I but it does not seem like a stretch to me to say = if you love listening to Christian Music like I do, you may also be a musician like I am or want to learn to play. Here are some ideas for you...
BTW did you see this blog for Christian Affiliates?
You may be able to tie in somehow or may at least enjoy reading it.
http://affiliate-marketing-forums.5s...1663#post11663