Another option is to mix your own XTOL workalike, such as Mytol or Instant Mytol. Doing so will require you to buy about half a dozen ingredients and a scale capable of measuring small weights. You'll then be able to mix up as much or as little developer as you like (within the limits imposed by the precision of your scale). You might or might not want to go to the effort, but you should be aware that the option is available.