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Sigma APO 100-300mm F4 EX DG listed on ebay for ~$250 before shipping. This lens doesn't show up for this cheap often at all.
Condition issues noted in the listing (faint marks and minimal fungus on optics, plenty of cosmetic wear on body).
Could possibly be a good deal for somebody looking for a bargain on a great tele option who doesn't mind working with some condition issues. I have no knowledge/relation to/of item or seller, I am by no means making an endorsement, and I won't be buying this one.