Where do I get replacement lamps for the Vernier Circuit Board (VCB)?

There are two different lamps provided with our Vernier Circuit Board (VCB). We sell replacement lamps for the cylindrical lamp (#48)as our order code BULB. This is 10 of these #48, 2.0 V, 60 mA lamps. These lamps are not commonly available at electronics supply outlets.

The other lamp has a round body and is a #50, 220 mA @ 7.5 V lamp. This is available at many electronics supply outlets, including Radio Shack as their part number 272-1133.