Hello Zirya
there are a lot of models of IPS in cisco.. you can buy the IPS 4215 if you are an enterprise with medium user ranges... otherwise there are higher end models like IPS 4240, 4255 etc.. you can have a look at all the models in the URL below:
http://www.cisco.com/en/US/products/hw/vpndevc/ps4077/index.html
additionally, u can also have a ASA 5500 firewall with a SSM module which can do full fledged IPS functionality..
hope this helps.. all the best.. rate replies if found useful..
Raj