Yes. The camera will accept SD or SDHC cards.
Any SD memory card with a capacity of max 4GB.
A canon memory card for your camera can be purchase at ebay or amazon or even at their corporate canon website. You may also try target or walmart stores.
The Canon PSC-55 does have a memory card pocket for two SD or SDHC cards.
Assuming you mean the Canon Powershot A810 - It uses SDHC memory cards.
512 TO 20,000
If it is a SD or SDHC card, then yes you can as I believe Kodak and Canon use them. The card typically has it's name on the front of it.
Most Canons use SD cards. There could be variations, though, especially if it is an older camera.
Sadly when you buy the camera it doesn't come with a card. I would suggest getting at least 2gb memory for your sd card, 8gb if you plan on taking more video.
SanDisk is a brand of memory card. The Canon A540 takes a certain type of card, see its instrucvtion book, probably it's a CompactFlash, but it may be a SecureDigital (SD). Take the camera to a pghoto retsailer and get the right card - many cameras are fussy about just which manifestation of card they can accept. SanDisk will almost certainly make a card to suit your camera.
I have a Canon Ixus 400 and have been using a 1GB Integral memory card on it for years - works absolutely fine!
how do i put my memory card in the camera, it won't fit
It depends on the camera and the size of the memory card.