Instrumentation Amplifier Gain resistor(s)

Hi. I am looking for Instrumentation Amplifiers for an application.  At this stage, we have decided a certain gain value for our Instrumentation Amplifier. The datasheet of the product mention the very precise value of gain resistors to attain certain gain value.

We haven't ordered the products yet as I am confused about whether we will be able to acquire the gain resistors ourselves (from some other manufactures) or they will come with the Instrumentation Amplifier package we will order?  Because these gain resistor values for certain gain sets are very precise which are difficult to get from manufactures. I am attaching the screenshot of AD8237 gain resistors from datasheet as reference

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