Suggested BOM for S&T Geotronics Open DSKY

Suggested Bill of Materials for S&T Geotronics Open DSKY - UK/European Source
Item Qty Description Manufacturer Supplier Notes  I paid £  Link
PCB v1.0D 1 in kit S&T Geotronics in kit    £   125.00  
3D Printed parts 1 in kit S&T Geotronics in kit    
Arduino Nano 1 Elegoo Nano board CH340/ATmega328P Elegoo ElegooUK 3 pack  £        8.99 https://www.amazon.co.uk/gp/product/B072BMYZ18
VA RTC 1 WINGONEER Tiny DS3231 AT24C32 I2C Module Precision Real Time Clock Module Wingoneer JUNTOP Global    £        4.99 https://www.amazon.co.uk/gp/product/B01H5NAFUY
IMU 1 Arduino GY-521 MPU-6050 Module 3 axial gyroscope accelerometer Arduino 4tronix    £        8.70 https://www.amazon.co.uk/dp/B008BOPN40
Buck StepDown 1 QSKJ DC-DC Mini Step Down Module 1.5V 3V 3.3V 5V 9V 12V 3A  Generic, MP2315 based Winwill    £        1.79 https://www.amazon.co.uk/dp/B075XRHNM2
SKM53 GPS 1 SKM53 GPS module Skylab Dominator yes really!  £     24.00 www.bavariandominator.com
Line Leveler 1 Logic Level Converter Bi-Directional Sparkfun Cool Components    £        2.39 https://coolcomponents.co.uk/collections/active-components/products/logic-level-converter-bi-directional 
Reed Switch 1 SIL Reed Relay 5v SPST NO Internal screen with diode
Pickering  106-1A-5/2D
Pickering pcarena-bristol on eBay datasheet  £        7.09 https://www.ebay.co.uk/itm/Pickering-106-1-A-5-2D-1-Form-A-SPST-5-Volt-coil-Single-in-Line-Reed-Relay/362307214145
DFPlayer Mini 1 DFPlayer Mini MP3 Player Module 24-bit DAC Haljia Hengjiaan    £        6.99 https://www.amazon.co.uk/gp/product/B01N6P237G
MicroSD Card 2Gig 1            
1" 16Ohms Speaker 1 1" 16 Ohm Neodymium full range 2W-5W speaker (this looks to be the only one that fits) thanks to Jochen for identifying supplier Generic timelyrain001 on ebay 2 off  £        3.28 https://www.ebay.co.uk/itm/2pcs-1-inch-16ohm-16-2W-5W-Neodymium-full-range-speakers-Loudspeaker-Foam-edge/163014103777
6AA Battery Holder 1 Battery box Generic Hobby Components    £        2.90 http://hobbycomponents.com/power/434-6-aa-cell-abs-plastic-battery-holder-box
AA Batteries 6            
Wire Terminal 1 2.54mm pitch pc mount connector block 2 pin Generic      £        0.99 https://www.ebay.co.uk/itm/2-3-4-Pin-5-08mm-2-54mm-X-2-Pitch-PCB-Mount-Screw-Terminal-Block-Connector-UK/262607754486
On/Off Switch 1 Black round rocker switch 12v SPST 20A/12V   LED-Essentials    £        1.90 https://www.amazon.co.uk/Black-Round-Rocker-Switch-light/dp/B006GQBZJ2
Maxim7219 4 MAX7219CNG LED Display Driver 8-digit LED   Maxim digitalcure on ebay.co.uk    £        5.40  
Sockets 24pins 4 0.3" 24 pin precision turned IC socket Generic mc_manager on ebay 5 off  £        2.39 https://www.ebay.co.uk/itm/Standard-Low-Profile-Turned-6-8-14-16-18-20-22-24-28-32-40-Pin-IC-Socket/231355183099
40 Female Pins 1 0.1" pitch female 40 pin header strip Generic alltopnotch on ebay 10 off!  £        2.69 https://www.ebay.co.uk/itm/10-x-40-Pin-Female-Single-Row-Strip-2-54mm-Pin-Header-Connector-0-1-Arduino-Pi/232346774001
10uF Capacitors 10 10uF Tantalum 35v + 10%          
15 Ohms Resistor 1 all resistors are 0.25W Metal Film 5%   I bought an Elegoo resistor kit    £        6.00  
100 Ohms Resistor 1      
470 Ohms Resistors 20      
1K Ohms Resistors 22      
10K Ohms Resistors 4      
100K Ohms Resistors 3      
NeoPixel RGB 18 5050 RGB LED with WS2812B Driver Chip Adafruit Cool Components    £        5.83  
LED PushButtons 19 LED Tactile Button - White 50mA 12mm Sparkfun Cool Components    £     38.34  
Laser Cut Button Caps 19   S&T Geotronics in kit      
7 Segments 820501G 21 SM820501G 7 Segment LED display 0.5"  Common Cathode 525nm Pure Green Through Hole mount ARK kt-elektronik on ebay.de 3 x 10 Pack  £     28.38 It's not that easy to get this colour in UK, even though it's generic manufacture.  Search ebay for '525nm 7 segment display'
3 Segments STG 3 in kit S&T Geotronics in kit      
Frosted Window 2 in kit S&T Geotronics in kit      
Electronic solder 1 Savbit Ersin Multicore alloy solder (for hand soldering) Savbit datasheet suggested  £        4.75 https://www.amazon.co.uk/Multicore-Size-Savbit-Alloy-Solder/dp/B0002JT3OS
VHB Tape AR VHB Tape 12mm wide by 0.5mm thick (use to fix battery box in place) 3M crafttapesrus on ebay suggested  £        3.49 https://www.ebay.co.uk/itm/VERY-HIGH-BOND-VHB-SUPER-STRONG-FILMIC-LINER-DOUBLE-SIDED-RED-MEGA-SUPER-STRONG/232530535462
Kapton tape AR Kapton tape self adhesive 10mm wide (add a little insulation where needed)     suggested  £        2.85 https://www.ebay.co.uk/itm/162709441249
Total  £   288.04
Derived from pictures and descriptions in the official build guide on Open DSKY website - use at your own risk
These are suggested components only - can only confirm suitability when DSKY is built and working satisfactorily