Remember the Brother HL-2170W from a couple months ago? It's a small-footprint, small-office laser printer that offers both Ethernet and Wi-Fi network connectivity. (USB, too.) Now it's 20 bucks cheaper, selling for just $79.99 shipped from Newegg. (Make sure to use coupon code EMCAJCBBF to get 10 bucks off the listed price.) It's a new unit, not a refurb, and you don't have to deal with any rebates.
My original post has all the deets you need on this printer, which remains a favorite in the Cheapskate household. It's rare enough to find an Ethernet-equipped laser in this price range, but one with Wi-Fi as well? The HL-2170W stands alone.