QB Issue Resolution:

gear>settings>products & services

click the product, select edit from the right side drop down on that line, change the price

Resolution for Issue 'How do I change part prices?' available: Yes (Solved).
Source: Intuit Community forum.

How do I change part prices?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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