[Mashiro]

A Raspberry Pi is a SBC (Single Board Computer) with a SoC CPU (System-on-a-Chip). That means all components such as the CPU (GPU is in the CPU), RAM and many other components such as USB jacks, Ethernet network jack, WiFi card are already soldered on the mainboard but cannot be replaced or upgraded. You don't need to buy RAM or a CPU for it. All you need for a Raspberry Pi is a good SD card (for the OS), a USB keyboard and mouse (wireless also possible), WiFi or a Ethernet cable, a USB-C power supply (for the new one - older use micro USB ) and a monitor with the right cable.

I guess you already have a) keyboard and mouse, b) a monitor and c) WiFi or Ethernet. Now you basically only need a Raspberry Pi starter kit that comes with the Raspberry Pi, a SD card, a power supply for the Raspberry Pi and other cables such as one for the monitor (probably HDMI to micro HDMI or HDMI with a HDMI to micro HDMI adapter). Depending on your monitor you might need a different cable. Let's say you only have VGA and DVI. In that case you need a micro HDMI to DVI cable or a HDMI to DVI cable with a HDMI to micro HDMI adapter. Alternatively the Raspberry Pi has component video so it can be connected to TVs that still have component video jacks.


(Source: https://www.raspberrypi.org/products/ras...4-model-b/)

You can also run the OS from a USB device but you will still need some kind of SD card because the bootloader has to be on the SD card and the Raspberry Pi generally automatically boots from the SD card. There is no BIOS on SoC systems so you cannot change boot behaviour but there are tricks like installing the bootloader on the SD card and the OS on a USB thumb drive or a USB HDD/SSD.

Your budget is a hard question. I don't know how much it would cost in your country. If it would be even available there so soon. Maybe you have to import it from somewhere else. That could include import costs and etc. I don't know the market for computer parts in your country. So hard to say what budget you need. Usually things like the cables are cheap and nowadays good SD cards with a lot of space are also cheap.


If I would buy the 2 GB RAM version from let's say RS Components and Amazon :
- Raspberry Pi 4 Model B 2G SBC for 39,08 € (RS Components)
- OKdo Raspberry Pi Multihead Power Adapter 5.1V / 3A for 9,29 € (RS Components)
- Samsung Evo Plus microSDHC 64 GB for 14,55 € (Amazon)
- Micro HDMI to HDMI cable for 6,45 € (Amazon)
Total: 69,37 € ~ $79

The thing is that usually there are bundles available that include the Raspberry Pi, a case, PSU, SD card and cables for less than if you buy component by component. Of course usually the included SD card might not be that good (slow for example) and the PSU might not be so high quality. These bundles as starter kits are enough though. You can easily buy better SD cards and such later to replace the cheap ones from the bundle.