I recently put down a used laminate floor, (without attatched underlayment), in a bedroom.
I used some rolls of underlayment from Menards.
And since the room was bigger than 100 square feet, I had to buy a second roll from Menards.
They sell a 100 square foot roll (36" by 33.34') for $30, plus tax.
Kimberly Clark Block-It. It was easy to use
So, here is 20 lineal feet, in the form of a 5' piece and a 15' piece for $10, cash, firm, NO TAX
Maybe it is enough for your closet, hallway, or so you don't have to buy another roll!
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