I paid $90. After trying it out, I called my buddy and told him to get one
17 February 2012
Summary: I purchased this as my 3rd Sigma out of 12 lenses. I wanted an all-around, full frame, light, fast to reasonably fast zoom, knowing that the sweet spot will never be 2.8 but hopefully it will be no greater than a 4. I got mine for under $90.00 including shipping. It is a primarily plastic, and I like it best around F4.
Summary: This is a great lens! Build quality is not Pro level, but optics are darn close! CA/PF rears its ugly head a bit, but nothing too major. If you can find one at a decent price, get it, you won't be disappointed!
Summary: Actually, it's my first DSLR and lens. I am using canon 60d and sigma 28-105 combination. this lens dosn't have IS function but in this zoom range that's not that big problem. however, the lens that i bought make an noise grating on my ears during autofocusing. I am not sure whether it's the problem of only this item or the genernal problem of sigma lenses.