I have about 7 inch girth. The only condoms that ever fit me right were the They Fit brand, in size U22. These have been withdrawn from the US market for over a year now.
However, if you live outside the USA, you can once again order them from Condomania.com (hopefully, US sales will resume soon, too!). For international ordering, see this link:
Condomania Online | TheyFit Sized-to-Fit Condoms
The next best condom for me, which I'm making do with now, is the Magnum XL. However, the "ring" at the base of these is narrow, and if you have a penis that is very thick at the base, they may tend to roll upward. In my case, the ring is so tight that it presses a sort of grove into my penis near the base after a while. The They Fit condoms didn't have this problem. Also, the magnum XL will fit an 8 inch long penis, but if you are longer than I am, it may be too short. They fit offered a longer length in big girth, for the real big boys.
Some of the other extra wide condoms offer a lot of 'headroom," but seriously narrow down toward the base. These are not helpful for guys that are wide at the base of their penis.
Some polyurethane condoms advertise that they are very wide. But, don't be fooled. This material stretches much less than latex, and the larger initial width is really just to get a comfortable fit on an average penis with less stretching. They will not fit large girth comfortably.
In response to the people who say that you can stretch an regular latex condom over your head or leg, that may be true. But, we are trying to cover a very sensitive part of the body in such a way that doesn't seriously reduce sensation. Unfortunately, a condom stretched too tight does just that. I am unable to cum with the Magnum XL, but could cum with the They Fit condoms, because the are a better fit, and allow me more stimulation.
The original poster does not state his sexual orientation, but talks about wanting condoms with spermacide. Bear in mind that spermacidal condoms are a big no-no for anal sex, because the spermacide irritates the rectal mucosa, and has been found to increase the risk of HIV transmission. Therefore, stick to silicone or water-based lubricated condoms for anal sex.