NOS 2a3 tubes

I've already tracked down some vintage (1945) Sylvania 6sl7 vt-229's and a Amperex metal base (1955) 5ar4, but I still need (2) nos 2a3 power tube for my Moth Si2a3. What I'm looking for are some RCA early 40's (blk) bi-plates with the "meatball" (round RCA) logo. i prefer nos but good anos will work too. I know there out there but - like all good tubes - hard to find. I've posted my query on AA as well, thanks in advance. I've already decided, but has anyone else mated a similiar speaker to a DHT 2a3 amp? My speakers are the Silverline Sonatinas; 93 dbs, stable 8 ohm load, simple xover, daul 6" woofers. The Moth Si2a3 puts out 3wpc.