I started buying the off brand Compact Fluorescent Light Bulbs at Walmart last year. A 4 pack is about $6.50. As our regular bulbs burn out, we been using these as replacements. I was surprised to find that they are now about the same size as an old fashioned light bulb, they fit fine in all my fixtures. The best part is that they use 75% less electricity. They are also supposed to last 3 times longer, we haven't had them long enough to test that claim. So far none of ours have burnt out, but the oldest ones are only about a year old.