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Amazon [amazon.com] has Oshlun LG-M01 Miter and Portable Saw Laser Guide for $12.50.
Shipping is free with Prime or on $35+ orders.

Walmart [walmart.com] also has Oshlun Miter & Portable Saw Laser Guide (LG-M01, Red Laser) for $12.50. Shipping is free w/ Walmart+ (free 30-day trial [walmart.com]) or on orders of $35+.