Dan, the lamps are generally common small bulb lamps that can be had from auto parts stores, online retailers, industrial suppliers and such.
eBay takes paypal - here are some sample listings just by searching the bulb number + bulb:
f:0" target="_blank">https://www.ebay.com/itm/5-R-5...SwjytadzrM:rk:7f:0
f:0" target="_blank">https://www.ebay.com/itm/2445-...xy63FSrO4B:rk:7f:0
f:0" target="_blank">https://www.ebay.com/itm/2447-...4502!US!-1:rk:4f:0