Walmart offers the Scotch Thermal Laminator, model TL902MIR, for $19.97. Opt for in-store pickup to dodge the $5.99 shipping charge. That's $8 under the lowest total price we could find for a similar item. It features a two-roller system and two temperature settings.
Update: As a reader found, Target offers it for $14.39 with in-store pickup after an in-cart discount.