Seems to be about the going rate for A0, may consider A1.. need to look at frames as well really...
http://www.supersizeprint.co.ukA0 - Photo Satin
£19.23 +£3.99
190gsm digital photo quality paper with a satin sheen finish. Printed with Epson UltraChrome K3 ink delivering stunning, photo-realistic image quality. The 8-colour inkset has the widest possible gamut for a fantastic range of expression and you’ll see subtle shadows and highlights when printing in black and white. Images are reproduced consistently in vivid, long-lasting colour. Light Fastness: Up to 75 years for colour prints,In excess of 100 years for Black and white prints.