If the condition of the sample is not critical(i.e., for SG, pH, tasting) and it won't be returned(and it never should be) to the batch, you might try one of those drinking water bottles that are so popular. Sanitize it, squeeze it(try on plain water, first) to see if you can get a vacuum strong enough to suck up a sample. Remember: the height of the liquid column is important: if vacuum is weak, try laying bottle slightly to the horizontal. Good luck.