Sleeves
When I entered my second childhood back in the '80's, I put all my cards in mylar sleeves because they were relatively inexpensive - around ten bucks per K . Unfortunately, I stored many cards upright in boxes and noticed after a few years that they were bending noticeably from the effect of gravity. So, I have to agree that, while polyester sleeves may be more attractive, the best long-term storage method is a rigid or semi-rigid sleeve. If we're considering no more than a few prized cards, however, which can lay flat, this firm has many reasonably priced sizes of polyester sleeves:
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