Kaspar of Monostable shared this helpful purchasing tool the 1clickBOM, a browser extension to quickly add electronic components to shopping carts:
1clickBOM is purchasing tool that let’s you keep one bill of materials (BOM) for items from multiple retailers. It’s a browser extension that fills your online shopping carts for you. To add items to 1clickBOM you simply paste from a spreadsheet or visit an online .tsv file.
Which retailers?
Currently supported retailers are:
-Digikey
-Mouser
-Farnell/Element14
-Newark
-RS
For more detail: 1clickBOM, a browser extension to quickly add components to shopping carts
French 
English