Got 12-13mh per one(8.1x64, cm9.
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It didn't change because the R9 280x didn't suffer from the issue that the driver was intended to fix.
The 280x was never a "truely good" ETH card in the first place - that was the 290 and to a lesser degree the 290x.
Tahiti is arguably the best performance/price ratio for FP64 anyone ever released, but ETH doesn't use floating point....
The 7970/280x was actually very good at ETH only at the beginning. With DaggerCoins at Epoch #0 or #1 or so it can get like 28MH/s. And a year ago you could of found them on Craigslist for $100 second hand. The R9 290 while it was a little faster was always expensive to buy because it had high demand for gamers and was hard to find for less than $200. So the 280x was a better choice if it wasn't for the DAG bug.
R9 290 wasn't hard to find at under $200 a year ago - MUCH under, yes, mine were $179 from NewEgg when I bought them last spring (Sapphire reference design, I think they were factory refurb cards).
It's going to be an academic point in a few months though since the R9 280x is a 3GB card (I don't think anyone made them with a different memory capacity, but I MIGHT have missed a model somewhere).
I don't remember ever seeing a R9 280x for $100 or less on craigslist, but I do remember seeing some in the $120-$140 range so I wouldn't be shocked if they were less in other locations at times - especially in or near large cities with more competition and more supply of used parts for sale.
Maybe in your area you had better luck but I also got them refurbished from NewEgg last year and it was the best deal out of anything I found on Craigslist. On Craigslist alone it was at least >$200 and they were rare and hard to come by. I think since they were flagship models they were made in smaller quantities than the Tahiti.
The Tahiti were flooded on Craigslist, probably due to Litecoin mining days as I found that almost 50% of the ones I bought off Craigslist were mined at some point in their life.