Ooh, I was considering some ad buys to promote the kickstarter for the LaTeX book I'm writing. I'd considered advertising on tex.stackexchange.com but found tha

Ooh, I was considering some ad buys to promote the kickstarter for the LaTeX book I'm writing. I'd considered advertising on tex.stackexchange.com but found that the pricing is closely held and apparently in the "if you have to ask, you can't afford it" range. Reddit, on the other hand, will let me buy an ad starting at $5 and the site I read talked about the $.75/CPM and said that the biggest challenge is that for niche products, it can be hard to actually get $5 worth of CPM in the time frame of the ad since the $5 is per sub-reddit, but this looks to be exactly what I want right now.