Terms of the deal were not announced.
Spreets – which has a relatively low profile on this side of the Tasman – claims 500,000 members across the two countries, and 274,000 vouchers sold.
Yahoo7 owns 51% of YahooXtra, with Telecom holding the remaining 49%.
Spreet is a one of countless sites worldwide trying to cash-in on the group buying craze.
Group buying sites typically feature a deal of the day, with the deal kicking in once a set number of people agree to buy the product or service. Buyers then print off a voucher to claim their discount at their local pizza joint or dentist or whatever.
The category hit the headlines late last year when Google reportedly offered to buy the most successful site, Groupon for $US6 billion.
Groupon.com turned down the offer, and is now planning an IPO, with $US1 billion shares issued, that values the company at $US9 billion.