Why is it impossible to find an Arrogant Sons of Bitches CD?

I collect cd's. I know I could download them all but I like having the actual cd as a hard copy to keep and sherish. I have never been able to find any cd besides one on Amazon. Does anyone have any ideas where I can look??? ASOB was an awesome ska band in the late 90's/early 2000's who released 9 albums but none of them are to be found.