i have my complete conversion ready to drop into another e30 for sale for £1800. thats everything including mounts,exhaust,custom prop ,loom ecu etc etc but converted back to stage 1 chip and yellows on a t34.48.
i bought my touring , which is a better speced mtech, for £1200 with 80000 miles on the clock , leather interior,lsd, electrics ,years mot etc and no rust issues, not 1 single bubble and completely solid arches etc.
you could build one cheaper if you do it yourself and you can choose the specific car for yourself as a base to start with.