Rather expensive, I'd suggest shopping online
Examples:
Cooler Master MWE Bronze 750W V2 PSU / Power Supply £139.99 - online famous retailer £65
2.7v Zener diode £0.79 - famous component retailer £0.15
Only sells 0.25 Watt resistors in packs of 10 at £2.00 - I can easily find 100 pack online for same price.