There is no need for you to buy your memory cards from suspicious sources. You know well that memory cards can not be repaired and so you must buy only a good card. Memorybits offers a standard one year guarantee on all brands of memory cards sold by it. Besides fabulous discounts which no one has given before are offered by this company. All bulk purchases are offered additional discounts. In case you find that the memory card you bought is not suitable you can always exchange it for another one. if it fails to function within one year of purchase a replacement would be made.