Hi. We all use memory cards on daily basis, regardless it's for your phones, mp3/mp4 player, digital camera & DSLR, digital photo album; even for your satnav GPS device.
If you are a student just like me, I believe USB thumb drive is a must for you. I find it comes handy to store my assignments, and most importantly tones of dramas and mp3s.
Check on this blog regularly to find some of the memory cards and thumb drive which suit your needs. They come in affordable prices.