only place you can get the incubators from, is from a player/crafters vendor, try doing a private vendor search, its worth bearing in mind the meaning of the 2 stats though, functionality relates to the time taken between each experimentation session, and quality, relates to its effectiveness, so personally i think the quality is most important, prices do vary, but you can probably expect to pay a lot for a incubator with negative functionality and positive quality, i would personally avoid totally any incubators with negative values in both.
for more detailed information try the official website. as it also has information on how to best achieve mutations etc.