Online ad firm ValueClick is to buy US company MeziMedia, which operates shopping comparison sites, for a price that may eventually reach $352m (£172m).
The eventual value of the deal will depend on whether performance targets are met by 2009, with $100m (£49m) to be paid upfront in cash.
Founded in 2001, MeziMedia employs around 160 staff worldwide, is headquartered in LA and has offices in China and Japan. The company generated revenues of around $40m (£20m) last year.
Its portfolio includes Smarter.com and CouponMountain.com, as well as sites in Spain, Germany, France and the UK.
The deal will give ValueClick a boost in the US, as well as a presence in China, where MeziMedia operates shopping comparison and coupon sites.