"Blue-plate special"

I'm working on a Wikipedia article on the phrase "blue-plate special." Current version is at
special and current text is below.
Any comments would be very welcome. (Or, of course, you can edit the article yourself at Wikipedia).
I'm particularly interested in pinning down current usage. I believe that it is very rare for restaurants, even diners, to offer blue-plate specials under that name today. Is this right, or do they survive? If so is it a true tradition or is it deliberately "retro?"

Here's the current article:
Blue-plate special or blue plate special was a term used in the United States by restaurants, particularly (but not only) diners. It referred to a specially-low-priced meal, usually changing daily. It typically consisted of "meat-and-two-veg" presented on a single plate (rather than more elegantly on separate dishes). The term was very common in the 1920s through the 1950s. As of 2004 few restaurants actually offer blue-plate specials under that name, but is still a widely used colloquial English phrase.
The origin and explanation of the phrase are not clear. Kevin Reed says that "during the Depression, a manufacturer started making plates with separate sections for each part of a meal?like a frozen dinner tray?it seems that for whatever reason they were only available in the color blue." Michael Quinion suggests that the the blue plates were, more specifically, inexpensive divided plates that were made in an imitation of the familiar Wedgwood "blue willow" pattern. One of his correspondents says that the first known use of the term is on a October 22, 1892 Fred Harvey restaurant menu, and implies that blue-plate specials were regular features at Harvey houses.

The term became common starting in the late 1920s. A May 27, 1926 advertisement in the New York Times for "The Famous Old Sea Grill Lobster and Chop House" at 141 West 45th Street promises "A La Carte All Hours," "Moderate Prices," and "Blue Plate Specials." A December 2, 1928 article, lamenting the rise in prices that has made it difficult to "dine on a dime," praises an Ann Street establishment where you can still get "a steak-and-lots-of-onion" sandwich for a dime and a "big blue-plate special, with meat course and three vegetables, is purchasable for a quarter, just as it has been for the last ten years." The first book publication of Damon Runyon's story, Little Miss Marker, was in a 1934 collection entitled "Damon Runyon's Blue Plate Special."
A Hollywood columnist wrote in 1940, "Every time Spencer Tracy enters the Metro commissary, executives and minor geniuses look up from their blue plate specials to look at the actor and marvel."

"No substitutions" was a common policy on blue-plate specials. One late-1940s Candid Microphone episode features Allen Funt ordering a blue-plate special and trying to talk the waiter into making various changes, such as replacing one of the vegetables with soup, while the polite but increasingly annoyed waiter trys in vain to explain to Funt that "no substitutions" means what it says.
Road food experts Jane and Michael Stern entitled their 2001 guidebook "Blue Plate Specials and Blue Ribbon Chefs: The Heart And Soul Of America's Great Roadside Restaurants."In contemporary use a "blue-plate special" can be any inexpensive full meal, any daily selection, or merely a whimsical phrasing. A travel columnist says that a Portland, Maine eatery offers "budget blue-plate specials along with more refined fare." The Turner South cable channel calls a daily movie selection, scheduled at lunchtime, its "blue-plate special." Mystery writer Abigail Padgett's second novel about amateur sleuth Blue McCarron is entitled The Last Blue Plate Special; no meals here, the blue plates are part of the decor at a clinic where patients are dying mysteriously.

A reviewer uses the headline "The Red, White and Blue Plate Special" for a review of a book on "Diners, Bowling Alleys, and Trailer Parks." The Boston Childrens' Museum presents a participatory-theatre show, sponsored by health insurer Blue Cross, which teaches good nutrition; the show is called "Blue Plate Special."