For comparison:
- 240$: https://duino4projects.com/open-source-multi-channel-eegecge...
- 500$ https://www.crowdsupply.com/starcat/hackeeg
- 1K$ https://shop.openbci.com/products/cyton-biosensing-board-8-c...
The above kit can be connected to an Arduino, of course. Or a Raspberry Pi, or your computer via the included USB board, or any other device you have in mind. You don't need to buy a specific board for your target device as long as you can connect the interface pins together.
I strongly recommend that anyone looking to use an ADS1299 EEG simply purchase the EVM from TI and use that instead. It's professionally designed and tested by the company that made the chip, and it's the same price or cheaper as these alternate boards.
I used to repair EEG systems, and work as an EEG tech.