We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
Can I make a tax-exempt purchase?
If our automated system applies tax and you wish to make a legally tax-exempt purchase, you must fax or email a copy of your tax exempt or re-seller certificate to us.
Include in your fax cover sheet the order number, amount and date of the purchase. We will refund the sales tax we collected to your credit card. Send faxes to the attention of the Lulu Accounting Department at 919-459-5867.
You may submit your form directly from our email support page. Click My Account > Taxes > Sales Tax Exemption and click I Still Need Help. Attach your tax exempt / reseller certificate, add any additional required information, and click Submit.