I need a spreadsheet with the zip codes of all
walmarts and Costco's in the continental US.

Dear newgauser-ga;

Thank you for allowing me an opportunity to answer your interesting
question. Here are the files you requested. In case you might need
this information also, for your convenience I have also included in
the spreadsheets, not only zip codes, but also store names, street
adresses, and area code and telephone number, sorted by the states in
which each of the stores are located (of course, you may re-sort it
however you wish):

COSTCO
http://www.geocities.com/tutuzdad/Costco.xls

WALMART
http://www.geocities.com/tutuzdad/Walmart.xls


I hope you find that my research exceeds your expectations. If you
have any questions about my research please post a clarification
request prior to rating the answer. Otherwise, I welcome your rating
and your final comments and I look forward to working with you again
in the near future. Thank you for bringing your question to us.

Best regards;
Tutuzdad ? Google Answers Researcher


OTHER INFORMATION SOURCES


PRICE VIEWER
WALMART LOCATIONS
http://www.priceviewer.com/walmart_locations/

PRICE VIEWER
COSTCO LOCATIONS
http://www.priceviewer.com/costco_locations/

Thank you- nice work!