B&H Photo Video offers the Pentax D-FA 50mm f/2.8 Macro Lens
, model no. 21530, for $263
with free shipping
. That's $80 under our mention from a year ago, the best now by $37, and the lowest total price we've seen. It features a focus clamp mechanism, metallic lens mount, 1:1 magnification, and 7.7" close focus capability.