The Raspberry Pi ecosystem is incredibly wide-reaching, and there are a lot of additional bits and pieces you can get ahold of to enhance your experience. Here are some of the best.
RetroPie
Raspberry Pi Pico W Development Board Raspberry Pi Pico Wireless
Raspberry Pi - Parallax
Raspberry Pi 3 Model B+
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American Raspberry Pi Shop
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Vilros Raspberry Pi 4 - 4GB Complete Kit with Clear Transparent Fan Cooled Case
Vilros Raspberry Pi 4 - 4GB Complete Kit with Clear Transparent Fan Cooled Case