Hay How do I select a good bale of Timothy hay?

Today I'm driving to a (somewhat) nearby feed store to buy a bale of Timothy hay. My mold allergies (the type of mold that grows in hay bales) have gotten pretty bad and so I'm on a quest to find a hay without mold. Honestly, my symptoms are to the point that if I cannot find a hay that doesn't irritate me, I will have to rehome my pigs. Myself and my kids would be heartbroken to do that, but I cannot live with eyes that are swollen and itchy and headaches all the time (and yes, I've done many thing to reduce my exposure to the pigs, keep them in a separate room, bought an air purifier, wear a mask when cleaning, take allergy medication every day, etc.).

But anyway, what are some tips to picking out a good bale of Timothy hay? Should I expect it to be all green, mostly green? What are the signs of mold I should watch out for? Other tips? Thank you!