The shape of these goggle frames are inspired by the Oakley Fall Line XL goggles. Designed in FreeCAD.
Cost estimate: $2.04 for frame (based on 102g of PLA at $20/kg), $8.97 for strap:https://www.amazon.com/SKL-Snowboard-Frameless-Protection-Interchangeable/dp/B0814F8VZB/ref=sr_1_4?dchild=1&keywords=snow+goggle+strap&qid=1576121603&sr=8-4 , and lens made from scrap plastic from tool packaging. Total of $11.01. 94.2% cost savings!
Link to retail comparison: https://www.oakley.com/en-us/product/W0OO7099S