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Sellout.woot.com [woot.com] has 10-Pack Foldscope Assembled Paper Microscopes w/ Lesson Plan for $ 37.79 ($ 3.78 each). Shipping is free w/ Prime, otherwise, there is a $ 6 flat ship fee per order.
10-Pack Foldscope Assembled Paper Microscopes w/ Lesson Plan $37.79 ($3.78 each) + Free Shipping w/ Prime