I bought mine from a specialty hardware store (Lee Valley Tools), but I've seen the exact same style/brand on Amazon: https://www.amazon.com/Hardline-Products-Scraperite-Plastic-Blades/dp/B0022ZI0JY

There's different "hardness" values for the blades... I got a 50-pak each of "soft" (orange) and "hard" (yellow) ones. For the car, I use the orange ones... for releasing 3D prints from my printer, I use the yellow ones. Based on the "frequently bought together" suggestion of Amazon, I would guess the color-coding of hardness is somewhat common...

https://www.amazon.com/Plastic-Razor-Scraper-Blades-Double/dp/B0046ZUNY8