Someone here was recently needing one of these CRT's,

Here is one on ebay-looks new.

http://www.ebay.com/itm/NOS-Vintage-RCA-Silverama-17DQP4-CRT-Black-and-White-Picture-Tube-/191215193730?pt=Vintage_Electronics_R2&hash=item2c85504e82

Also saw this posting 1day left....more NOS CRTs

http://www.ebay.com/itm/Choice-on-New-Old-Stock-Picture-tube-NOS-Cathode-Ray-Tube/281364347237?_trksid=p2047675.c100011.m1850&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%2 6asc%3D22695%26meid%3D7814241872281315889%26pid%3D 100011%26prg%3D9176%26rk%3D2%26rkt%3D10%26sd%3D191 215193730