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docs: add pricing to BOM

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hackpads/slab-hackpad/README.md
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# Slab-Hackpad
A module of the slab v3 keyboard project.
A module of the slab v3 keyboard project designed to be a Hack Club hackpad.
See [headblockhead/slab](https://github.com/headblockhead/slab) for the main project.
## BOM
### PCB
- 1x Seeduino Xiao rp2040
- 2x PCA9555PW I2C I/O Expander
- 1x SN74AHCT125PWR
- 2x 0603 10k resistors
- 2x 0603 2.2k resistors
- 1x MMBT3906 PNP transistor
- 1x SSD1306
- 1x HYDZ HYG-7525A-5027
- 2x Korean Hroparts Elec PJ-320D-4A 3.5mm TRRS jacks
- 1x (M+FM pair) [Adafruit 5358 magnetic connectors](https://www.adafruit.com/product/5358)
- 32x 0603 100nF capacitors
- 20x Kailh CPG151101S11 hotswap sockets
- 29x SK6812MINI-E
- 2x ($1.70) PCA9555PW I2C I/O Expander
- 1x ($1.03)* SN74AHCT125PWR
- 2x ($0.09)* 0603 10k resistors
- 2x ($0.09)* 0603 2.2k resistors
- 1x ($0.46)* MMBT3906 PNP transistor
- 1x ($1.99) SSD1306
- 1x ($0.97)* HYDZ HYG-7525A-5027
- 2x ($0.46)* Korean Hroparts Elec PJ-320D-4A 3.5mm TRRS jacks
- 1x ($6.50) [Adafruit 5358 magnetic connectors](https://www.adafruit.com/product/5358) (M+FM pair)
- 32x ($0.20)* 0603 100nF capacitors
- 20x ($?.??) Kailh CPG151101S11 hotswap sockets
- 29x ($2.66)* SK6812MINI-E
total ~$16.20 + cost of Kailh sockets
(prices with a * have minimum order amount applied)
### Case
- 9x M3\*5.7\*4.6 heat-set inserts