I'm afraid they're not really worth anything individually. Some of the later ones around 1100 might be worth a quid at most each, as they're a little rarer than 800-1000. But that's still pushing it. And you'd have a hard time finding people to buy them.
The thing about 2000AD is there are absolutely buckets of them floating about. Especially progs 400 - about 900. It really was all over the place. Those ones are only worth about 20c each at most.
It would have a certain amount of value as a collection though. If you could find the correct person to buy it from you. I've personally put together a collection of 1000 in the last couple of years, and most of that was either given to me for free or bought in bulk at car boot sales for next to nothing.
You'd be better off just hanging on to them!
- Actually, one place where I've picked up lots for cheap was that comic shop in temple bar. I can't remember the name. It's on the corner around from Temple Bar Music Centre. He always has old progs stocked. Might be worth your while asking if he wants them.