For a panel temperature reading, there might be something cheaper - bare copper wire, or the CJ value of an existing thermocouple input.
Using a length of T/C wire assumes that a direct-connection T/C analog input is available. A direct-connection T/C input requires cold junction compensation.
A piece of bare copper wire across the thermocouple input terminals will produce the cold junction temperature (the temperature of the input's connection terminals) measurement as the value for that input.
Some devices will report CJ temperature of an 'in use' T/C input as a useable, taggable process variable, so an 'additional' input point might not needed for a panel temperature reading.