If you're looking for something thicker and more rigid than a typical record sleeve, check out these record toploaders from BCW. The high-impact rigid PVC keeps the album snug while protecting the corners. If you've ever dropped an album, you know how easy it is to dent the corners. These protectors will prevent that.
At around $3 each, it would be pricey to use these for your entire collection. We recommend them for your more valuable albums or as a simple way to display records (they look awesome with our DIY holder).
They were sold-out on the BCW website so I picked up a set of 5 from The2Buds here for $15. Additional discounts are available based on volume so if you have some friends into vinyl, you can split a larger pack.