The seller hasn't responded to my email, so it's probably already sold. In any event, I found out the one I was looking at is called the Hamilton Beach ChefMix 60690, and was maybe introduced around 13 years ago; I found a review dating to 1999. It has 290 watts and comes with 4 qt and 2 qt stainless steel bowls, 2 beaters and 2 dough hooks. It sounds like it is a medium-duty mixer, which probably would be all I need.
The new HB mixer that Charles linked to is model 63325 for $99. It appears to be their current middle-range mixer, plastic body, 300 watts, single 3.5 qt bowl, single rotating flat beater and also comes with a whisk and dough hook. It has a 1-year warranty.
The TOL consumer-grade HB mixer is their Eclectrics line, as others have mentioned above. It is $200 for the white model, with diecast body, 400 watts, single 4.5 qt bowl, flat beater, whisk and hook, and a 3-year warranty. I've seen plastic-bodied used Eclectrics for sale on Craigslist, but the new ones are all metal.
For around $200 you can also get a Kitchenaid Classics mixer, but the HB Eclectrics seems to be comparable to the Kitchenaid Artisan, which is $300.
Kelly could give us the lowdown, but I seem to remember him not being crazy about any of the current Kitchenaid offerings. In any event, anything costing more than $50 takes it out of the "play" range for me and becomes more of an investment, which is what a good stand mixer should be, I suppose. I'll keep looking, and thanks for the suggestions.