That one at Tractor Supply looks identical to the one from Harbor Freight, except the HF one is orange. But in any case, it looks to be the same one I bought at Pep Boys for $99 about 6 months ago. It was regularly $149 but I came across a $40 Pep Boys rebate deal at the time. I think it's the Torin T32001, shown here:
http://www.torinjacks.com/ProductDetail.aspx?ProductId=119
They all look the same and it could be that they all come from the same source in China. Anyhow, it worked just fine when I pulled the small block from my 5.0 Mustang. In fact, with the rebate money I got the companion engine load leveler ($29.99), and yanked the motor myself. But I do think you can do better than $169 for it. Also, you're going to want to try and find it locally, since it is a heavy mo fo (200 lbs) and will surely cost some big bucks to ship it. I've seen the same one go on Craigslist here in L.A. for less than $100. Plus, if it comes down to decision time, do spend the extra few bucks for the folding one over the cheaper non-folding model. It really does fold up fairly small, meaning that you can live with it in your garage. But the bottom line is that these are all a really good deal since the local tool rental yard wants $40 a day for essentially the same thing. Do a couple of engine pulls with your buddies and it's already paid for itself.