Walking through the racks at Nordstrom Rack last week, I watched a girl snatch the last pair of Onitsuka Tiger Mexico 66 sneakers, marked down to $89. I couldn’t help but wonder: could I get a better deal on something similar through a pandabuy spreadsheet? Two weeks later, I had my answer. As Jake Morrison, a 26-year-old graphic designer living in Austin, Texas, I’m all about clean lines and minimalist streetwear. My style leans toward Japanese denim and subtle branding, but my budget as a freelancer doesn’t always match my taste. That’s where the world of agent-based shopping comes in. I started with a pandabuy spreadsheet I found on Reddit.…