See Les’ response here, to quote:
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If you plan on using EE for multiple clients over time, then I highly recommend you purchase on behalf of the client. That way you can take advantage of our Volume Discount Program. Each software purchase you make on the same expressionengine.com account is logged so that as you meet milestones as indicated below you will automatically receive the discount. The discount plan is cumulative, allowing you to purchase what you need today and still receive a discount when you meet any of the milestones at a later date. Please note that the volume discount plan only applies to ExpressionEngine and ExpressionEngine module purchases. It does not apply to installation services or 30-day demo sign-ups.
Volume Discount Milestones:
3+ purchases, 10% off
6+ purchases, 15% off
10+ purchases, 20% off
15+ purchases, 25% off
20+ purchases, 30% off
30+ purchases, 40% off
40+ purchases, 50% off
Transferring a license is easy, here’s how.
1. Have the client register at expressionengine.com here: http://expressionengine.com/member/register/
2. Email sales the license number you want transferred and the client’s expressionengine.com user name.
3. We’ll transfer the license and notify you when the transfer is completed. After the transfer all further notifications will be sent to the client as if the client was the original purchaser. Please note we do not notify the client of the transfer, we leave that you.
That’s it. We’ll transfer the license. When we transfer a license you receive a “Developer credit” which counts as a purchase toward the Volume Discount program.
