Prices checked online 4th August 2017, total 570$ new price.

Controllers (102$)
1x Arduino Leonardo with headers, AN000057, RS Stock No. 761-7324 (18$)
1x Arduino Esplora, A000095, RS Stock No. 774-8150 (44$) + 1x Arduino 1.77" SPI LCD Module with SD, AN000096, RS Stock No. 782-4585 (20$)
1x Sparkfun Arduino Pro Mini 328 - 5V/16MHz, DEV-11113 (10$)
1x Sparkfun Arduino Pro Mini 328 - 3.3V/8MHz, DEV-11114 (10$)
 
Shields (248$)
2x Arduino XBee Shield for Zigbee, A000021, RS Stock No. 696-1670 (13$)
2x XBee-PRO ZigBee RF Module, XBP24BZ7WITB003J, RS Stock No. 719-3834, Digi International (40$)
1x 2.4G Wireless nRF24L01+ Module, Itead (5$)
1x Quasar QAM-RX2-433 315 MHz, 433.92 MHz, RS Stock No. 617-2044 (12$)
1x Quasar QAM-TX3-433, RS Stock No. 617-1811 (4$)
1x Quasar QAM-TX1-433, RS Stock No. 617-2072 (4$)
1x Arduino MEGA Sensor Shield with power, T020040, TinkerKit!, RS Stock No. 748-5433 (24$)
1x Arduino 1.77" SPI LCD Module with SD, AN000096, RS Stock No. 782-4585 (20$)
1x Arduino 9 Axes Sensor Shield, AN000070, RS Stock No. 865-9001 (22$)
1x Arduino Arduino Motor Shield Rev3, AN000079, RS Stock No. 758-9349 (23$)
4x stepmotor driver board ULN2003A, 4-phase 5-line, LC electronics (2$)
1x IRF520 MOSFET module, T010020, TinkerKit!, RS Stock No. 748-5379 (8$)
1x Arduino Proto PCB Rev3, A000082, RS Stock No. 696-1673 (3$)
1x dual DC stepper controller, sadi.net, motor control v3.0, empty PCB
 
Sensors (76$)
1x 2-axis LPR5150AL gyroscope, T000060, TinkerKit!, RS Stock No. 748-5344 (18$)
1x 3-axis LIS344AL Accelerometer, T000020, TinkerKit!, RS Stock No. 748-5332 (16$)
2x Grove Water sensor, SEN11304P, Seeed studio (3$)
1x G1/2" water flow sensor, POW110D3B, Seeed studio (10$)
1x Grove PIR motion sensor, SEN32357P, Seeed studio (9$)
1x Grove collision sensor, SEN03281P, Seeed studio (9$)
4x Ultra sonic sensor, US-015 (2$)
 
Servo (20$)
1x 10g servo, No. 8503, Robbe (8$)
1x 37.2g Servo S 3003, No. F 1259, Futuba Robbe (12$)
 
ICs (54$)
4x 23K256-I/P MICROCHIP, SRAM, 32 Kbit, 32K x 8bit, 2.7V to 3.6V, DIP (1$)
3x PIC16F690-I/P - PIC16F690 20-pin Flash 4kbyte 8MHz Microcontroller (2$)
8x Microchip 24FC1026-I/P EEPROM Memory, 1024kb, 1.8-5.5V DIP8, RS Stock No. 823-3261 (3$)
8x Allegro Microsystems A4950ELJTR-T, Brushed Motor Driver IC, 40V 3.5A, SOIC8, RS Stock No. 753-2028 (2$)
1x TI DRV8843PWP, Stepper Motor Driver IC, 45 V 1.75A, HTSSOP28, RS Stock No. 742-2870 (4$)
 
Components (50$)
5x LM1117-3.3V regulator - Texas Instruments (2$)
5x LM1117-5V regulator - Texas Instruments (2$)
5x IS471F IR Receiver, 950nm, Through Hole, 5 x 2.5 x 4.4mm, Sharp, IS471F, RS Stock No. 564-396 (4$)
1x Miniature Speaker, MURATA, VSLBP2115E1100-T1, RS Stock No. 747-5029 (5$)
1x bag full of SMD resistors, inductors, diodes, relays, capacitors, LEDs, microphones, push buttons, zener diodes, crystals. 500-1000 components. (?$)
 
Other (20$)
2x Nokia 5110 LCD (5$)
2x Handheld Enclosure, ABS, Black, 57 x 35 x 12mm, CAMDENBOSS, 2955-20R-4, RS Stock No. 540-1458 (5$)