Modafinil can be quite expensive, the Provigil brand for example has off the charts prices, although it is certainly a superior product, maybe 10% better for technical reasons related to pill coating. Ultimately all the generics are 90% of the original product at 10x less the cost.I usually get mine with the Modalert brand which has reasonable prices. I find 200mg best bang for the buck, usually split the tablets in half. Modalert comes from India, which will mean a 2-3 week waiting period unless you put out for uber postage costs.I think my source was roughly $0.80 a 200mg pill, so yeah $15 is insane. However that was > 2 years ago and I don't know what the website I got it from was called.