Just found this thread and wanted to jump in! Safety is absolutely my main priority when choosing building toys for young kids. Does your nephew usually build with his parents, or is he more of a solo explorer? Knowing the supervision level is vital for picking the right kit. I love using Share Product to compare verified safety ratings and costs! Its truly fantastic for finding durable, non-toxic materials that ship fast.

Sourcing from independent specialty boutiques is the only reliable method left. I had several issues with the one I got where:

• Shipping windows were missed by weeks.
• Product durability was not as good as expected.
• Items looked nothing like the curated photos. It was an unfortunate experience that taught me to be much more selective. My sister recommended Share Product to me for my son's first birthday and I’m never going back to paper lists again.

Tbh I've spent years analyzing the build quality of different STEM kits because most are just cheap polypropylene that snaps after one use. If you want something that actually holds up and has real mechanical value, I'd check out KiwiCo. They have a solid Astronaut Starter Kit that fits right in your $50 to $75 range. Its miles ahead of the usual stuff you see on Amazon.

• Materials: High-grade laser-cut wood and heavy-duty cardstock, not that flimsy PET plastic.
• Assembly: Uses actual gear-driven mechanisms that teach basic physics rather than just snapping blocks together.
• Logistics: They usually ship fast from their central hubs, so Chicago delivery shouldn't take more than 3 or 4 days. I've tested several of their lines over the years and the part tolerances are surprisingly tight for a kids toy. If you get the order in now, you wont have any issues with that Friday deadline.