Two illustrative curves below. Per-unit price is printed against each quantity band. No contact-sales gate; the number is on the page.
These figures are illustrative of how a curve reads. The live curves are category-specific and printed on each procurement page, with GST shown separately. No volume figure is treated as a secret you must negotiate to reach.
The price for your quantity is on the page. Start a quote and it restates that number — it doesn't replace it.