Irish Cockney,
Sorry I can't help with the shirts, though I could probably rustle up some fakes from the markets here. You will have a fantastic time in Peru, a really great country, but keep your wits about you in downtown Lima. Nobby was playing for us when I was there so he was an easy source of conversation with locals in my comedy Spanish.
At that time Solano was a national hero so I saw a few Villa shirts scattered around the country. Having said that Peru hadn't fallen victim to the Sky propaganda and other S American football was the main staple on TV, with a fair amount of Barca and Real Madrid thrown in. I went to a game in Cuzco and until I came to China had never seen such poor top flight football - comedy diving and histrionics, with players rolling 10 metres after a foul to gain advantage.
Please PM me if you need any tips etc.