seconds hand harness all the time mate, cost wise im not certain, you could be lucky and get it for 50 quid, you might get it for an average 100 quid, check the for sale forums for vehicles being broken,
i did this on a mk1, so the same as a mk2 and it took about an hour and a half with everything out, carpets seats n all, not hard at all, just some minor rewiring was needed to be done on a control box but very simple pin swapping.
I cant imagine it would be much different on a mk3 like yours
can we have some more detail about your car to see if we can get some more info for you on weather it might already have the connections there?