eBay has the AOC 160Hz 35" Curved Gaming Monitor (Black/Silver, C3583FQ) for $300 with free shipping. List price: $630. Features 2560 x 1080 resolution, 160Hz refresh rate, 50M:1 DCR, 300cd/m2 brightness, 4ms response, D-Sub, DVI, HDMI, DP.
eBay has the 31.5" LG 32MP58HQ-W 1080p FHD IPS LED Monitor (White) for $160 with free shipping. Features full HD IPS display, on-screen control with screen split 2.0, black stabilizer, reader mode.