I can't help you with your project, but I can tell you I've wanted to try the same thing for at least 10 years. The cost has always held me back. It's always fun to find like minded people, especially with a goal that is such a niche. In fact, it is a niche goal within another niche goal.
I will at least share my logic in wanting to do this, so other's might understand if they don't already.
1. I want to be able to lucid dream any night.
2. Accomplished meditators have enhanced awareness that makes lucid dreaming easier to achieve.
3. Neurofeedback offers an accelerated way to gain skill in meditation.
4. Sleep studies use the same type of EEG equipment that one would use with neurofeedback, and offers graphing of one's sleep cycles.
5. Since Neurofeedback equipment and sleep study equipment are basically the same, and both are usefull for LD goals, then there you go...
Best wishes with your endevours, I'll be looking forward to more reports.