Streaming programs

Are any of you aware of any customer choice programs (preferably gas) that
are of the "streaming" variety, that is, the utility purchases a particular
package of gas for a customer and the customer pays the price for that
particular package rather than the WACOG. This type of program would be used
where direct access has not been adopted. I need to know for a data request
in a Southwest Gas gas ASAP. Thanks.