The partnership is the 41st new agreement since CarRentals re-launched its site earlier this year amid a flurry of accusations against other meta search sites in the travel, in particular TravelSupermarket.
The site has now signed deals with car hire brands such as Holiday Autos, Alamo, Thrifty, EasyCar and Hertz.
In February CarRentals slammed other meta search sites for “playing” with the comparator model.
The criticism led to a fierce response from TravelSupermarket, revealed in Travolution, in which managing director Chris Nixon labelled the attack as “a cheap swipe to drive attention to its re-launch”.
Speaking of the 30m.com deal, CarRentals marketing director Gareth Robinson said: “This is a great deal all round for 30m.com, carrentals.co.uk and the travelling public.
“Customers can get some of the best prices available online because we don’t charge our providers for ‘click throughs’.
“They only pay when they take a booking, which is the ultimate in ROI [return on investment] for an online travel brand.”