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Spark Sport costs $24.99 per month (with some Spark mobile and broadband customers able to claim a $5 rebate), while Sky Sport now costs $49.99 per month (although it can fall to $24.92 per month if a customer pays $299 to commit to a 12-month bundle).
That means someone who buys both services together will save up to $25 per month.
Spark said the bundle would only be available to any broadband or mobile customer on contract. It won't be available for those on pre-pay.
The initial period of the deal is six months.
Neither side would comment on commercial terms.
No-one had been picking that the two competing sports streaming services would be offered in a single bundle. But it's not the first time Spark and Sky have cooperated.
Spark offered Sky's earlier sports streaming service, Fanpass, to its own customers at a cut-price rate under a wholesale deal.
Sky hosted a 2019 Rugby World Cup channel for its commercial customers, providing Spark with an at-cost way provide pubs and clubs with easy access to the tournament.
And after Sky bought entertainment streaming service Lightbox from Spark for $6 million, the telco's qualifying customers still got free access under a wholesale deal for six months until June this year, when Lightbox was merged into Sky's Neon.