It is a real problem. I personally am lucky and have platinum rtd that my business owns. In an ideal world every keeper would have something like it. Sadly this just isn't possible due to the high price.
My solution is to find a super cheap one that is speced at no greater than 2 degrees F out (+/-2f) and buy a bunch. Place them together and discard the wild ones. If you have a few accurites this could also be done but I still do not like batteries inside. Ideally 5 or more that should give a better range.
Something like this
http://item.mobileweb.ebay.ca/viewit...d=130569406068
http://item.mobileweb.ebay.ca/viewit...d=320989741440
If you don't mind metric. When the cord gets damaged or it starts reading poorly I just replace them.
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