Does anyone know where I could get old United shirts? from 2000-2008.
If you know what to look for, you can get these for between 5 and 25 quid on eBay. I only need 5 shirts to complete my "Premier League era" collection, and I've not spent more than 24 pounds on a second-hand shirt. I got the 2002-2004 home shirt for £3.20 and the 09/10 away shirt for £4.
Just make sure everything looks legit - compare photos of the listing to photos of the actual shirts, avoid new sellers and sellers with low scores or few reviews, and look at multiple listings of the same shirt to make sure it all checks out.
Also, for newer shirts with the tags still attached, I've noticed that the real ones from SportsDirect or the United store have the tags in the armpits, whereas the fakes have them in the neckline. I'm not sure if this a real thing, but it's something I look out for before buying.
I have saved searches for various keywords so I won't miss a listing just because it's written differently. For example; Manchester United shirt, Man united shirt, man utd shirt, manchester utd xl, mufc shirt etc.
Hope that helps!