Magazine bags are probably the cheapest option while providing good protection. The backing boards are optional, mainly for rigidity. If you're storing them upright (as in magazine boxes), you'll want to make sure that either the box is full or you have backing boards or something to keep them from "slumping" resulting in creases at the spine and/or curling over the years. Flat storage is best for long-term, but may cause difficulties depending on your set-up.
The comment regarding removable tape is a good one too if you're going to be taking them in and out of the bags. Over time, most tapes tend to bond rather well with the plastic of the bags, resulting in stretching or tearing when you try to get them open. Often I find it's easier to just slit the tape and re-tape afterwards.
You can find magazine bags, boards and boxes at most well-stocked comic shops, or through online retailers like BCW.
All that said though, there's nothing wrong with using Ultra Pro pages to store them in, and if you've got them in binders that you flip through on occasion, that may actually be preferable to individually bagging them.
Just my 2 cents...
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