Sony announced that they have sold over 15,000 OLED monitors (or actually they will have sold that number by the end of the month). Back in April 2012 they announced that they sold 10,000 monitors, so it means they have sold 5,000 monitors in 6 months (about 800 monitors a month). When we discussed OLEDs with Sony's OLED product manager back in February 2012 he said that the OLED fab at Nagoya Japan is running at full capacity.
Sony also published several "customer stories". RAI Radiotelevisione Italiana has just purchased 1,105 monitors (not sure which model) that will be supplied over a three year period. Dutchview from the Netherlands are also using OLED monitors, and Turkish Ozkan Production has equipped eight of its outside broadcasting vehicles with Sony's OLED monitors(they are using 34 PVM-1741 monitors and 6 PVM-2541 ones).
Sony also announced a new OLED monitor, the PVM-741 - a direct replacement to the older PVM-740. The PVM-741 sports a Sony-made 7.4" 960x540 OLED panel and adds several features to the older model (new vector scope and waveform zoom functions, a new color focus function and more).
Sony offers several monitors in several sizes (from 7.4" to 24.5") and in several series (BVM-E, BVM-F and PVM). Sony's OLED monitors provide a superior image quality compared to LCDs, and the cost difference is not so large because in these premium products the cost of the panel itself is a small portion of the total product cost. Sony also offers a medical grade 25" OLED monitor.