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Beginning MONDAY August 26, Subway will sell any footlong sandwich for $ 6.99 — a steep discount considering that some footlongs can cost as much as $ 14 in some cities. It’s the privately held chain’s latest attempt at luring back customers who are balking at rising fast food prices and spending less when they do go out.

The deal has a catch: The offer is only available via its app or website with the code "699FL" and ends on September 8.