I'm a bit of Moore fan...
I don't think that Roger and Me or The Big One are available on DVD. I bought mine on NTSC import tape. I'd be glad to lend them to you if you want.
Roger and Me is, in places, quite distressing. The BigOne is much more humourfull and as such is more accessible and easier to watch. Moore's work is deliberately unsettling though so you can't expect to watch it and come away jumping for joy.
Gordon