Computer parts are really hard to break if you keep them in a dry place, away from static charge, they should be ok. So try to not store it in a room with carpeted floors. But other than that they're built to withstand years of intense heat/cold and be fine so just sitting on a shelf won't hurt them. Like basroil said only really buy it if it's a great deal. If it's 10% off ddr3 now, in a few months it'll be 20% off.