I just saw one of these this past (Labor Day) weekend at the Sam's up here in Grapevine, TX (just north of DFW airport). Don't know what the model is called, but the brand was Smoke Hollow and it had Propane (left)/Charcoal (right) with Smoker Firebox on the far right & an Infrared Side Burner on the far left.
I just took a very quick look at it, as my wife was already checking out, but it caught my eye and have been trying to find it online to look at it in more detail. As you already know, Sam's does not have it on their website (as of today) even though it is in their store(s). And I can't find anything about it online elsewhere to substantiate its existence, other than my Google searches turning up your post on this forum. (Not being much of a fisherman, I joined the forum just so I could answer your post and let you know that Sam's actually has these in stores... at least the one up here.)
In my online searching, I have found two brands with similar grills, the Char-Griller Duo (2020 and 5050) and the Brinkmann Dual Zone [ http://bbq.about.com/od/gascharcoalg...apr021110a.htm
]. (Also found a Kenmore that doesn't offer the Smoker option box and another Brinkmann -Triple Function - that doesn't separate the cooking chambers.) The Brinkmanns, in particular, had very poor build-quality reviews.
After reading about both of those, I'm thinking/hoping this Smoke Hollow version is newer (maybe nobody has gotten around to getting it on the web yet), and appears better from what I saw (infrared side burner), but I did not get to inspect build-quality at all.
I'm not yet a big griller/smoker (although aspire to be), but I have never heard of Smoke Hollow. Found their website [ http://www.olp-inc.com/
], and no mention of this product (yet???), but they appear to come from the "Smoker manufacturer" side of the business, so I'm hoping they have addressed many complaints with the other grill/smokers about not having a well-sealed smoking chamber.
What appeals to me about this grill, going from left to right, is the:
-- infrared side burner/grill (the flat rectagular fiber burner unit type, not a regular round steel/brass side burner obstructed by a metal plate to make it "infrared") - in theory/I've been led to believe that infrared burners can get much hotter than regular burners so you can really sear steaks and then finish at lower temps. Also, I plan to use this as a regular side burner, not necessarily for beans, etc., but more often to move indoor frying to the outdoors to keep the house from smelling like dinner the next morning. Hopefully the infrared burner will heat up a cast iron skillet better than a traditional side burner.
-- propane gas grill - for quick grilling
-- charcoal grill - for (hopefully) more flavorful grilling. Also had a 5 or 6 level lever to adjust the charcoal height, which seemed really handy to very quickly adjust heat (faster than a crank and easier and safer than sticking your hands over the heat to adjust the shelf by re-hanging the sides of the shelf on different hooks, which I've seen in other charcoal grills)
-- smoker firebox - to use the charcoal chamber as a smoker. If I recall correctly, the fire box also has a grill (maybe they all do), so with the side burner on the left also being a grill (in contract to the others), for large crowds you have quite a bit of grill space on four separate cooking areas.
In the store, the marketing signs on the unit said the grates were porcelain-covered cast iron, but they didn't look porcelain-covered to me. I understand that cast iron is the best for grilling because it holds more heat than stainless steel so when you slap cold meat on it, it doesn't drop in temperature as much -- maybe the issue being that if you turn the meat over in the same spot, you'll still get a good sear for the other side, while stainless steel grates might be somewhat cooler. However, with uncovered cast iron, more maintenance is involved to keep them from rusting.
I think the warming rack was a perforated sheet of metal, rather than grates, which I've never seen before. Maybe blocks some heat for better warming rather than further grilling. And I don't think there were any hooks or trays for condiments or tools.
Anyway, I guess I'll have to make my way back to Sam's soon if I want to check this out more closely since you and I are apparently the only ones on the web who have seen it. Hopefully they do have it at a Sam's near you.
Hope this helps.