There shouldn't be any more gen 4 Glock 19 with the issues. it's one of the popular guns in the 9 mm. My cousin local dealer wouldnt order any thing gen 4 when They first came out. That guns sells for 528.00 by him in the FDE, gen 3.
With the extra mag you get with the gen 4 your local dealers don't seem out of hand in their price. Gen 4 comes with 3 mags, gen 3, two.
http://www.skunkriverarms.com/_2_G19_FDE_9mm.JPG