Unless you have a huge budget AND what you use them for has dramatically changed, why not keep & cherish them until you can no longer buy spare bulbs? By then it is just possible that there might be affordable LED equivalents with a lifetime of even a tiny fraction of that of a decent halogen Fresnel. We all talk about the availability of bulbs, what about gel? Until about 6 months ago it seemed the choice in gel always seemed to be getting bigger, Lee have discontinued one range, some colours in their standard range have been discontinued and my supplier says that some whilst on the Lee's list are not currently available until (if) they make some more. Obviously other ranges / suppliers are available but I can only see colour choice going down.