Cross, you can get them at can tire.
They are about the same quality of the accurites. That said they are not very accurate. They specs (last set I saw is 2ºF and 15%RH up or down) are not very good. I personally don't like placing batteries in enclosures either. I would suggest cheap aquarium thermometers (I pay about 1-3$ each off ebay) I recommend buying a handful and checking them against each other (3 min and 5 is better) Using the ones that read the same they are likely correct. The hygrometers I like are analogue ones from humidors (about 8$ each western instruments are my personal fav) they are more accurate out of the box than most digitals and can be calibrated easily so checking and correcting is a simple task.
http://www.amazon.ca/Brass-Analog-Hy...pd_sim_sbs_k_1
http://www.ebay.ca/itm/Digital-LCD-T...ht_3685wt_1398
some of these only read ºC so if you care about ºF check carefully.
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