I just got some prices the other day...
From
ePer
735303207 (microphone) 42 Pounds
46831352 (sim card adapter) 12 Pounds
46790149 (bracket) 7 Pounds
51732349 (gps/gsm antenna base) 144 Pounds
46772567 (gps/gsm/easy go antenna) 7 Pounds
51727440 (electric cable) 43 Pounds
71718768 (steering wheel controls) 197 Pounds
And then some of the parts I got real prices from a dealer for (mangoletsi...
www.mangoletsi.com)
735303207 (microphone) £38.39
46790149 (bracket) £6.84
51732349 (gps/gsm antenna base) £129.72
51727440 (electric cable) £37.26
71718768 (steering wheel controls) £177.79
It's only worthwhile to get the cn+ unit itself second hand from someone, I think the
ePer price is like 1400 pounds or something
EDIT: If you buy the proper GPS base and antenna, you can just replace your existing antenna - if you buy an aftermarket one, I think it has to go somewhere like the inside of your windscreen so it can pick up the satellite signals