I have a used Sigma 17-70 Lens for sale. It is the older 17-70 DC Macro 2.8-4.5 (non HSM/OSM) model. It does do a little more on the macro end than the newer models and is smaller and a lighter as a result. It's a great knocking around lens.
It does have a little wear that's cosmetic on the front, and one very small spot of dust that won't come off (looks like it's on an inside element), neither affect the shots at all. I'd rate it at B to B+ condition.
This is a very useful "hunting" lens when you're not sure what you're going to shoot. Needs about 60mm of extension, behind a small dome.
I'd like $275 for it, with free ground shipping in the US. CC or Paypal for payment. Reply: Jack@OpticalOceanSales.com or 800-359-1295