Check it out:
amazon.com/dp/B0058OQ3H2/?tag=viewnow-20

An unreviewed but neat one that does both 2.5" and 3.5"
amazon.com/dp/B009T27ZWG/?tag=viewnow-20

These look a bit more bulky but with better cushioning:
amazon.com/dp/B0066WVFLO/?tag=viewnow-20

These are nice if you need a bunch:
amazon.com/dp/B004UALLPE/?tag=viewnow-20

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