Mobile-compatible offering of commercially identical items for post-retail sale

A method comprising:

• receiving a first text message, from a first subscriber number, that identifies a provider, an item, and a quantity of commercially identical units within the item;
• receiving a second text message, from a second subscriber number, that indicates a request relating to the item;
• and
• transmitting, to the second subscriber number, a response to the request.

A method comprising:

• receiving, from a mobile software application resident on a second mobile device, a request to purchase an item;
• determining, based on a query of an inventory database, that the item matches a plurality of commercially identical items purchased by a user of a first mobile device as part of a retail package that includes the plurality of commercially identical items;
• providing, based on a location of the second mobile device and a location of the first mobile device, an indication that the user of the first mobile device has the plurality of commercially identical items available for purchase;
• receiving, from a mobile wallet resident on a second mobile device, an indication of a purchase of one or more of the plurality of commercially identical items from a user of the first mobile device;
• and
• updating, based the indication of the purchase, the inventory database to remove the purchased one or more of the plurality of commercially identical items from the quantity of one or more of the plurality of commercially identical items.