it costs Â£25-Â£20 at my vet but sometimes they have specials (not much point in me telling you that as we're in differnt countries)
to me microchipping gives peace of mind. i know if my cat escapes and gets picked up by an animal shelter all they will have to do is scan her and she will be reunited with me in a matter of hours.
i would highly reccomend it. all it is is a tiny chip smaller than a grain of rice which contains a serial number. the serial number relates to your name, address, phone number etc. if your cat goes missing it can be scanned for a chip and you will be notified.
Maverick has already been chipped and the kitten is getting done thursday.