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Pentax SMCP FA 100mm F 2 8 AF Macro Lens | eBay Note that item is misdescribed in ad as FA 100. Pictures clearly show the current model,
DFA 100mm f2.8 Macro WR, one of the best macro lenses available in K-mount.
Reviews:
SMC Pentax-D FA 100mm F2.8 Macro WR Reviews - D FA Prime Lenses - Pentax Lens Reviews & Lens Database Pentax-D FA 100mm F2.8 WR Macro Review - Introduction | PentaxForums.com Reviews
Seller is Survey Supplies, an arm of C R Kennedy (official Pentax distributor). Seems to be new old stock.
Best new price in Australia is around $A650. Can be had for less on ebay, eg this one from Japan for $US445 (about $A575 at present + shipping):
http://www.ebay.com.au/itm/like/171716525970
But the Survey Supplies one has the advantage of the 1-year statutory warranty. I'd say a good buy at under $A620.