USB card readers come in many flavors and are available just about anywhere - make sure it is able to read whatever kind of card it is you use in your camera - it's as small as a thumb drive and easier to handle - stick the card in the slot, plug the USB end into a USB port and there you go. Check out the many results of my Google search:
https://www.google.com/search?q=usb+card+readers+for+mac&ie=utf-8&oe=utf-8
I've always used one; some computers have card readers built in. I got a free one from Sandisk when I bought a high capacity SD card from them. This is the one I got (but that does not mean you have to use that one - you do need to get one which will read your type of card; if not sure, ask at your nearest photo store):
http://www.amazon.com/Sandisk-MicroMate-Memory-Reader-SDDR-113/dp/B000YBH4YU