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I have contacted the customer service desk at Harbor Freight. You can buy the CFL 12 volt bulbs, the cost is $9.72 each.
To order give the part number of the solar panel kit and part number 4, this is how the CFL are listed. You can on buy direct from California, home office
Even though I don't currently* use the lamps I would thank you for the time to check that out.
I started wondering about Harbor Freight's supplier for the kit components, and perhaps there's another outlet. Well, I didn't get that far but did find out who makes some of the kit components & thought I would post it. A company called Topray, or Shenzhen Topray Solar Co Ltd.
Check out some of these links;
http://www.topraysolar.com/uploadfiles/download/E-catalogue.pdf ( page 5, 7, 18, 20, 22)
Btw, notice on pg 22, the 3 in 1 adaptor.
currently* 12v pun detected.
Sorry for the huge link. This is the Topray 4 pack for $36.99, free shipping.