Quantity   Component name
8 × Arduino Nano From eBay for £2.50 ish
1 × set of 50 WS2801 LED string lights eBay £27 ish
30 × simple, panel mounted pushbuttons £20 for 30
1 × load of cut MDF about £10 from local hardware store(B&Q), including cutting
1 × can of white primer £8 from B&Q
1 × can of white gloss £8 from B&Q
3 × power regulation boards (switch mode) about £1 each from DX.com but other available on ebay, size is key for the repeaters
8 × power bricks (12V) £2.23 each from ebay
8 × power sockets £3.27 for a pack of 10 from ebay
1 × load of misc resistors from work/home stock
2 × 433MHz recievers (STX882 ASK) couple of quid from tindie.com, make sure you get ones with a chip on, the others barely work.
6 × 433MHz transmitters (STX882 ASK) couple of quid from tindie.com
2 × picture frames from ebay, couple of quid a piece
1 × 1 Meter of ws2812 led strip again off ebay, about £20