http://www.ebay.co.uk/itm/AUDI-A1-2013-3-DOOR-SEATS-SEAT-SET-VGC-/141353544318?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item20e953ea7e

Not really that cheap tbh, paid £200 for mine and they are out of a five door so I've got centre seatbelt in rear which tge 3 door doesn't have

 

Also rears are not a direct fit on these, you need to chop up your fabia frames and weld the lower mounting points onto the audi frames, the foam and fabric will not swap straight onto audi frames due to the bigger hole in the top for the newer style seat lowering handle.