Google "condoms" or similar and go to the various manufacturers' websites. Condoms come in different styles and sizes. If your local outlets do not stock medium or large sizes, you may have to order on line.
Use plenty of lube--and, on the condom itself. When you find a make/model that fits you comfortably, apply a bit of lube just to your glans and
not the shaft. This will provide more "wiggle room" and transmit more friction.
You may also want to try and evaluate natural condoms; however, these offer no barrier to STDs.
http://www.avert.org/usecond.htm