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At $ 12.68 for a 4 pack, the blocks are $ 3.17 a block at Amazon.
A 10 pack at Walmart [walmart.com] is $ 36.04 with a carry case or $ 3.60 a block if you want a carrying case.

https://www.amazon.com/Camco-Leve…00480BWBE/

From the camco site: Heavy duty blocks are safe and easy to use. They offer many options for leveling single wheels, dual wheels, hydraulic jacks, tongue jacks, stabilizer jacks, 5th wheel jacks and tandem axles. Customize your levels: Stack interlocking blocks to desired height.