Adidas online have the retro 1985 Manchester United home & away shirts for £23.99 plus you can get an extra 20% off using code EXTRA20 & its free delivery at the moment. So £19.18 for an Adidas United shirt. All sizes available at time of posting. Also just noticed that they have both the white & the blue away shirts available as well as the classic red home shirt.
Hope this helps those United supporting oldies, cheers Madcow