How can I set up different product prices for each customer?
In QBO, they have Price Rules (still Beta) if you've paid for Plus or Advanced. This feature is not available in the other two lower plans.QBO Price rules allow you to provide discounts for specific products to certain customers for a specified amount of time. For more detailed information, you can check out this article:https://quickbooks.intuit.com/community/Inventory-and-projects/Set-pricing-rules/m-p/185449
I cannot see that setting and I have the Plus version
If you've Plus plan (at least in the US version), you should have the Price Rules feature.
Call them, if you don't have them. You're already paying for this feature in your plan.
(But be prepared to wait for 30-60 minutes)