Reddit reviews Bertech ESD Mat Kit (Made in USA), 18 Inches Wide x 30 Inches Long x 0.094 Inches Thick, Blue, Includes a Wrist Strap and Grounding Cord, RoHS and REACH Compliant
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SURFACE RESISTIVITY: 10e9 - 10e10 ohmsKIT: Includes an ESD mat, a wrist strap with removable alligator clip, and grounding cordMATERIAL: Made of a single layer homogenous polymer mix with ESD propertiesTHICKNESS: 3/32 inches +/- 10%APPLICATIONS: Aerospace Assembly, Computer Operators, Computer Technicians, Electronic Assembly, Fiber Optics Manufacturing, Hospitals, and Solar Industries
I usually just slip the board back into the ESD bag it came in before storing it. If you managed to buy a board without an ESD bag, you can pick some up pretty cheaply on Amazon.
Other than that, I've not taken much precaution while working with dev boards (though I do refuse to hand a board directly to someone else if we're not both grounded--I always set it on a table and make them pick it up) and, in 16 years, I've never damaged one with ESD. However, I consider myself lucky. If you live someplace especially dry or you seem to be especially static-prone or you're working with boards that you absolutely cannot afford to fry, then you might buy an ESD mat and grounding strap to use when handling your boards. Here's an option from Amazon (first search result, you might look around a bit before purchasing): https://www.amazon.com/Bertech-Wrist-Strap-Grounding-0-093/dp/B00O0Q03KM
For storage though, an ESD bag should be more than sufficient.