There are a number of different calibrators out there that can be used. We would recommend the X-Rite Eye-One Display or the Spyder.
You can purchase these from wherever you like. If you order a X-Rite Eye-One Display OR Spyder via Kayell Australia (NOT Kayell QLD) you can get a 10% discount by using Coupon Code: spyderinkfx
Also, if you're unsure about your monitor for editing and colour accuracy definitely speak with the guys at Kayell Australia (Not Kayell QLD) who are experts in the field and are able to recommend quality monitors to suit your needs.
Here's a cool video about the Spyder! Enjoy ;)