I just noticed that the dollar stores near me are now fully stocked again with pool noodles.
I bought some last year that I used when I moved, and they have been quite useful for protecting/storing playfields, as packing materials for odd-shaped items, and for padding when transporting pins (the pins were wrapped in plastic first).
I highly recommend them if you're not using them already
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[edit]: As for the shrink wrap, see here: https://pinside.com/pinball/forum/topic/where-i-you-get-your-shrink-wrap-from