Yes, there are affordable 1440 monitors (and overclockable, too!)

From the comments on For anybody on the fence about 1440p..., a lot of you think 1440 monitors costs upwards of $500. I thought the same thing after looking at Amazon. But, through the magic of asking around on reddit, I discovered a raft of Korean monitors that are 1440 and also overclockable -- for less than $300.

Here, for your consideration, is the relevant filtered search on New Egg.