I assume you're paying someone to do it? If I were doing it myself I'd hope yo have it done for less than £500 (decent used subframe, new (M3) bushings, maybe a press/puller tool set, consumables, alignment).
I'd ask a decent indy for prices with or without parts and go from there. Would hope to see not much over £1000 all in. At £2000ish I'd have doubts too.
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