Zebra Technologies offers "next-day shipment" on an enormous variety of barcode printer media stock, and it is offered through the Zebra ZIp Ship Program.
All Thermal Transfer and Direct Thermal Media Products available through the Zebra Zip Ship Program (pdf)

> Go to Zebra Labels

If you prefer a more economical solution to your barcode printing needs, Tri-State Business Systems can supply you with TSBS brand Label and Tag Stock. The TSBS labels and tags are high-quality media stock that is fully compatible with Zebra, Sato, DataMax, and Intermec Barcode Printers.
Complete Listing of TSBS Brand Label and Tag Stock (pdf)

> Go to TSBS Labels