Any cigar shop will have them but probably only have the Xikar which is great. You NEED a to calibrate it. The easiest thing to do is pick up a Boveda calibration kit while your there. If you want to save that $5.00 you can use the salt test method. Either way it will be +-1 - 2%. Any cigar shop will have this stuff. Even if you tell them Hey I need a digital hygrometer and calibration kit, they will fix you up. The discount cigarette shops probably wont have it. Here is what you are looking for.
http://www.famous-smoke.com/boveda+o...+pk/item+23350
http://www.famous-smoke.com/search.c...egory_id=40016
Trust me, it will be a thousand times better than the accurite. Like I said cigar people are extremely obsessive about our RH. I even have one network temp/hygro that tweets my temp and RH every hour. Ridiculous? Very. Obsessive...... Depends on who you ask.
If this is one of the things you are anal about. This is 100% the way to go. I am pretty sure you can order a Hygroset adjustable hygrometer and the calibration kit from Amazon as well. Do NOT get one if you aren't able to calibrate it. The only one you can't calibrate that is really super accurate is the Western Caliber III but it looses itself after a few years.