I’ve modded mine with 16 GB DDR-3 3200MHz RAM [2], a 2 TB NVMe SSD [3], a Wi-Fi 6AX card [4], the Innolux N140HCG-GQ2 1080p 100% sRGB 8-bit 400 nits panel [5] (based on the T14 display), and the Lenovo 61++ battery [6].

Depending on region and local pricing, all mods together should be around 300$.

[2] https://www.amazon.de/dp/B08LQG2SDS/ [3] https://www.amazon.de/dp/B07MLJD32L/ [4] https://www.amazon.de/dp/B097TQ7HBF/ [5] https://www.xelent-store.de/Innolux-N140HCG-GQ2-400cd-Low-Po... [6] https://www.amazon.de/dp/B06WGMPFCD