Amazon offers Prime members the WBM 8" Hand-Carved Salt Lamp, model no. 1002, for $14.88 with free shipping. (Non-members can spend $35 to bag free shipping; otherwise, it adds $10.) That's $5 under our mention of a similar lamp in November and the lowest total price we've seen. (It's also a current low by $5.) It purports to have air purification properties.