Many of the stores offering educator discounts for home school teachers will require an educator's ID. If your homeschool support group or co-op does not offer you an ID card, you can create your own* or use the ID Card tool at Homeschool Buyers' Co-op. You can print your own or order a PVC card for around $7. Additionally, some independent study programs and cover schools will provide you with an ID.
*Note that when using an ID that you'd created yourself or received through a co-op, etc. you may have to provide additional proof to the retailer, such as a copy of your Affidavit of Intent to Home School, or curriculum receipts.
Some national chains in our area that offer educator's discounts to home educators include JoAnn, Michael's, Staples and Office Depot. Call your local store in advance and/or check the chain's corporate website for more information.
Occasionally, employees of chains with a policy to extend their teacher's discount to home educators will be misinformed and may tell you that they will not provide you with their educator's card or discount. In this case, I would recommend politely asking to speak to the manager on duty. It helps if you've brought in a print-out of their policy (usually obtained on their website). If you are unable to resolve the issue with local store management, you can always call or e-mail corporate for additional help and information.
And remember...it never hurts to ask! Many hotels, travel companies and even restaurants offer educator discounts and you just might be able to get in on some of the deals! Home schooling can be expensive, particularly if you travel as part of your educational program, so don't forget to claim your discounts when you can!