Try skroutz.gr. Bear in mind that IPS is not a good choice for gaming due to the high response times. Also one more thing you did not give is at what resolution you want the monitor to have as maximum.
For example myself I have a 27 ASUS IPS 1080p for gaming (i did not mind the response time), but it costs more that the max price you set. The VX239H 23' is a similar model much closer to your price limit.