There are a few folks who ship to CA. I live in Texas but did work in Fresno. M&P's are probably hard to find because they are well made and popular. For what it is worth, I think any citizen in Fresno County who hasn't been to prison should be allowed to carry at least one pistol. That would even the odds a little with all the thugs and gangbangers in Fresno.
After the rant on Fresno,
This is a 4" 45 ACP M&P
S&W M&P45C 45 4" Black 8R $501.00 SHIPS FREE
This is a 4.5" 45 ACP M&P
S&W M&P45 45ACP NS Black $581.00 SHIPS FREE
This is the same pistol elsewhere.
Online Gun Dealer LWRC Rifles for Sale at On Point Firearms - SW M&P 4.5" 45ACP BK 10RD FM SAFE CA SW M&P 4.5" 45ACP BK 10RD FM SAFE CA
M&P45 .45ACP - Smith & Wesson
S&W doesn't catalog them in an M&P in a 5" any longer. I didn't find them at my favorite gun store in Austin either.