my commodores key has started not wanting to unlock my car

i figured its got a battery in it and prolly needs replacing

so today i dropped into my local former holden dealer (they still have holden stuff everywhere inside)

they took a look at my key and gave me the 'oh yours doesnt have a battery it has a CHIP' 

so instead of replacing a battery i need to replace the whole bit with buttons ect, just the key bit could be transferred over

how much i ask?

lets see, $120 for the part, then $100 to recode it to your car!

$220, i walked away saying 'rediculous'