Supplies are limited, and when they're gone, they're gone.

AG-1 "peanut" flash bulbs (clear or blue)

Choose clear for black and white, or blue for color. Of course, you can use blue for black and white too. These require a battery to fire.

These are a more powerful version of the AG-1 bulb. Choose these if they're recommended by your camera manufacturer, or if ordinary AG-1 bulbs don't provide enough light. Like standard AG-1s, these require a battery to fire.

Your camera uses flash cubes if the flash socket looks like this. The socket shape is a cross, and the pin in the center of the socket is round.

Flash cubes have electrical contacts. A battery in your camera provides the power to ignite the flash.

Flash Cubes

The original flash cube, four "peanut" bulbs arranged as a cube. Your camera automatically rotates the cube as you shoot pictures. The bulbs are blue, so OK for color film as well as black and white. Choose High-Power flashcubes if recommended by your camera manufacturer. High-power flashcubes produce significantly more light than standard flashcubes. All flashcubes require a battery to fire.

Box of 3 Flashcubes, 4 flashes per cube
Product FLSH-FCUB
 

Box of 2 High-power Flashcubes, 4 flashes per cube
Product FLSH-2PACK
 

Your camera requires Magicubes (or X-cubes) if the socket looks like this. The socket shape is an X with a square pin in its center. There are no electrical contacts, and the camera's flash socket has four studs (see detail below).

Magicubes do not have electrical contacts, and the camera does not require a battery for flash. 

Magicubes, also called X-cubes
An improved flash cube, four "peanut" bulbs arranged as a cube. Your camera automatically rotates the cube as you shoot pictures. They're blue, so OK for color film or black and white. Because they self-ignite when the shutter button is pushed, no battery is required.

M2 and M3 flash bulbs for many 1960-era cameras, like the popular Brownie Starflash pictured. Blue bulbs give proper color balance with the color films of a half-century ago, and of course they also work with black and white. Clear bulbs are for black and white. A battery is required to fire the bulb.

These blue color-balanced flashes fit into special flipflash sockets. You shoot six flash pictures with the bar inserted one way, then remove it and flip it over to shoot the next six. 12 flashes in all.

These were invented especially for the Polaroid cameras of the day, and since Polaroid films make ten photos per film, flashbars have ten flashes per bar. The fit into a special flashbar socket, and do not need to be flipped over. Blue for color or black and white film.