Here is the a link to the thermometer that is sold at wal-mart. Also below is a link to another thermostat, I have heard of a lot of complaints with the 500r.
http://www.walmart.com/ip/Acu-Rite-I...mometer/896347
http://www.amazon.com/Hydrofarm-MTPR...+For+Heat+Mats
The half log hide you have looks a little small for you ball, here is another link for some inexpensive hides.
http://www.reptilebasics.com/hide-boxes
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