What is the best website to advantage of Best Price Guarantee?

[Harren]

I found total rewards has the best prices on the internet so far even better than booking, but booking will only match the price if I file a claim, is there any other websites that perhaps offer a discount on top of matching the price?

[royaltywears]

bookit.com usually has cheap deals going on, used them once to price match for Cosmo through mariotts LNF deal