hey people want to know how much places like supercheap, repco etc. charge to install a sony headunit (not purcahsed from the store, but has everything needed to setup) and remove the old one (93' corrolla seca rv) also the current radio/tape/cd unit is split 2 dim ie. radio, tape up top then cd down bottom, any way to cover up the hole where the cd is now? also do they install 2nd hand head units (works fine, just been used before..)? also how much extra would it be to install some 6" splits? please no flaming and telling me to call, just asking to hopefully save me the trouble of calling arround tomorrow, thanks