Homes in Terrytown use a special type of light bulb in the house number light fixture.
As of September 19, 2014 replacement bulbs are available at:

Lapalco Hardware
2020 Lapalco Blvd, Harvey, LA 70058
(504) 367-2020

Other possible sources:

Delta Electronics
1505 8th St, Harvey, LA 70058
(504) 366-1753

Light Bulb Depot
5900 Jefferson Highway,Harahan, LA 70123
(504) 733-0383