The problem is that your local yard will be half or less than you could get from a regular cat dealer by mailing them which will way more than offset shipping costs. Find a reputable dealer and go for it. I'm much more leery of a couple local's checks than the "big guys". They live and die by "Internet reputation"- literally. You could easily double the amount you get for them. Most of the dealers will gladly advise you on shipping.

40 cats??? Have you ID'd them all? That could be thousands of dollars.