Ros Davies has all sorts of useful maps available on her site including for the following towns:
Ardglass, Ballymacarrett, Ballynahinch, Banbridge, Bangor, Castlewellan, Comber, Crossgar, Donaghadee, Downpatrick, Dromore, Hillsborough, Holywood, Kilkeel, Killough, Killyleagh, Moira, Newcastle, Newry, Newtownards, Portaferry, Rathfriland, Rostrevor, Saintfield, Strangford or Warrenpoint. Road Map of County Down Ordnance Survey Maps of 1836 Map of Ireland - Provided by the University of Texas Libraries Maps of Counties & Towns - Commercial site offering Irish Townland Ordnance Survey map reproductions for sale (survey dates 1829 to 1843) Outline Map of Kilkeel Townlands Topographical Roadmap of Kilkeel and Silent ValleyWonderful map of Ireland ...about 1570 
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