Alternative to Mylar

I'm guessing the guy is looking for a cheap alternative which panda plastic is not for like $3 you can get a 5 foot by 5 foot blanket they may even be bigger than that and are made of aluminum and work just fine
 
I'm guessing the guy is looking for a cheap alternative which panda plastic is not for like $3 you can get a 5 foot by 5 foot blanket they may even be bigger than that and are made of aluminum and work just fine

it may be cheap but is not good for a grow box, doesn't reflect well, keeps the box worm and may create hot spots therefore not recommended.

white paint as robert said works good as well.
 
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