Chemical Availability Search has data about chemical suppliers and costs of chemicals, including some bulk pricing information.
Tip: sort by price and look at the cheapest to find bulk quantities. Sorting the quantity column does not work well as it does account for the different units of measurement.
Password information:
You will need to create an account to use the Chemical Availability Search.
On the login page, do not use the "access through your institution link" or the username and password boxes. Instead click on register (at the bottom right of the page) and create an account. You'll need to use your Heriot-Watt email address to register.