My son would like a spare key for 02 reg corsa which he bought with only 1
key.
Dealers seem to charge about £160 for a key which seems a bit steep.

I have found blank keys with transponder chips for around £10 on ebay, but
these would need cutting and I guess the car would need some sort of
reprogramming to use the new transponder as well, which I believe auto
locksmiths can do.
But I haven't found anywhere that supplies the section containing the remote
switches/battery holder/circuit board that slides into the key body ? Can
these be purchased anywhere, and will this require reprogramming as well, or
just the usual resync procedure you use when the battery is replaced ?

Thanks
Tony