Reddit reviews 4 Ft - 1/2" PEX Aluminum Heat Transfer Plates, (100/box) for Radiant Heating (HP-4) by PEX GUY - Made in USA
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Genuine PEX GUY Brand platesProudly Made in USA48 inch long (4ft) Aluminum Plates for 1/2" PEX pipingDimensions: 48" Long x 4.31" Wide x .016" Thick0.016 Thick High Quality Aluminum Heat Transfer Plates
Ya, thinking about it a bit more I will probably skip the floor heating for the garage. More effort than it's worth. Might do a couple loops in the house though. Maybe something like https://www.amazon.com/Ft-Aluminum-Transfer-Radiant-Heating/dp/B009KT7PO6 since I have a partially finished basement that give me access to the most of the floors on the main level.
Regular old heat transfer plates should be cheaper if you're willing to build around them.
Eg
https://www.amazon.com/Ft-Aluminum-Transfer-Radiant-Heating/dp/B009KT7PO6