It may depend on your definition of reasonable. There's that drugstore in Boston that carries unusual scents. It's the only source I've found. I know Nid Hog has used them and been happy. I got MUGGED at Basenotes for questioning their practice of shipping Knize 10 with no box and cap.
A lot of people swear by them. I think K10 is about $70 for 100ml. They have a website but it's crap. Seems like the kind of place you need to call and jawbone with really. They are responsive to email Sent me a sample vial of K10.
Someone will chime in here I hope. Columbia Drugs? Is that it?
I think you're referring to Colonial Drug.
http://www.colonialdrug.com/