Thanks for the comments on my avatar. A friend of mine who is a macaron baker (ex- art director) in Amsterdam did it for me.
What does reasonably–priced mean to you? What you think is expensive might be cheap to someone else. It's important to consider where your market is - you can charge more in most big cities than in small towns so cost of chocolate is one thing to be factored in. Right now there are too many unknowns.
In what quantities do you want to buy? It may be that prices are high because you are buying in small quantities. As for a basis for comparison, take a look at the prices for couverture on Chocosphere.com and on Amazon.com. You should to that before you come back with more questions.
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@DiscoverChoc