Here is a GE warm white square fluorescent bulb from the 1960s .
Too bad these bulbs never became popular as they really would look nice in a fancy modern office environment.
I understand that there were problems with them keeping their seal after being in service for a while.
The correct GE ballast for this bulb is GE 7G3733 Bonus Line, but I don't know where you would find one.
I am into T17s, or I would be interested in this bulb.

http://www.ebay.com/itm/RARE-GE-General-Electric-Panel-F-Square-Fluorescent-Lamp-Deluxe-Mid-Century-60s-/181484701297?pt=US_Light_Bulbs&hash=item2a4154c671


Two Sylvania 15 watt white bulbs.

http://www.ebay.com/itm/Antique-Vintage-Fluorescent-Wall-Mount-Pivoting-Desk-Lamp-2-Available-/111426685801?pt=LH_DefaultDomain_0&hash=item19f18c4b69

A clear 40 watt lumiline from GE.

http://www.ebay.com/itm/VINTAGE-GENERAL-ELECTRIC-LUMILINE-LAMP-BULB-TUBE-120-VOLTS-40-WATTS-CLEAR-GE-/141351792350


Westinghouse 48 inch slimlines.

http://www.ebay.com/itm/2-Sylvania-22403-F24T12-CW-Straight-T12-Fluorescent-Tube-Light-Bulb-/111425838777?pt=US_Light_Bulbs&hash=item19f17f5eb9

http://www.ebay.com/itm/Westinghouse-slimline-F48T12-D-Fluorescent-Tube-Daylight-48-1-tube-only-/121400759535?pt=US_Light_Bulbs&hash=item1c440c94ef


Norelco 39 watt F48T12.

http://www.ebay.com/itm/Norelco-F48T12-CW-Fluorescent-Tube-HIGH-48-1-tube-only-/111425834610?pt=US_Light_Bulbs&hash=item19f17f4e72

Sylvania 48 inch.

http://www.ebay.com/itm/Sylvania-F48T12-D-HO-T12-HO-Fluorescent-Tube-Daylight-HIGH-OUTPUT-48-/111425832248?pt=US_Light_Bulbs&hash=item19f17f4538

Information about the square fluorescent lamp in James Hooker website.

That is $53.11 for each square bulb in todays money.

That could add up at bulb replacement time.
If a room had ten bulbs to replace it would cost $531. plus labor
This also could have been part of the reason for being discontinued.