Red alert on e bay.

NOS 20 watt T12 GE red bulbs.

http://www.ebay.com/itm/RED-24-fluorescent-bulb-F20T12-R-GENERAL-ELECTRIC-NEW-OLD-STOCK-20-WATT-BI-PIN-/181354875701?pt=LH_DefaultDomain_0&hash=item2a3997cb35

Looks like there is still one available.

http://www.ebay.com/itm/GE-F20T12-RED-Vintage-Industrial-Lighting-24-/111210984094?pt=US_Light_Bulbs&hash=item19e4b0f29e

15 watt red.

http://www.ebay.com/itm/GE-F15T8-R-Red-Colored-18-Fluorescent-T8-15-Watt-Bi-Pin-Base-Lamp-Light-Bulb-/110859869786?pt=LH_DefaultDomain_0&hash=item19cfc35e5a

That 15 watt MAZDA is a beauty!

The 15 watt has been on there for a LONG time. Apparently the seller has a ton of them. I occasionally consider, but being only a single lamp, and a colored one at that (I don't care for colored lamps), I hold off.  It's a steal for a lamp from the 1940s, though!

I love the colored fluorescents, but I already have a pair of those nearly identical to that one.  That is a helluva deal!