Newegg Business offers the refurbished D-Link 16-Port Unmanaged Gigabit Rackmountable Switch, model no. DGS-1016D, for $49.99. Coupon code "RECOMS3" cuts it to $34.99. With free shipping, that's tied with our refurb mention from last month as the best price we've seen. (It's currently $87 below the best price we could find for a new one.) It features 802.3, 802.3u, 802.3ab, 802.1p, and 802.3x support.
A 90-day warranty applies, but it's unclear who backs it.