Please post some, I hate waiting for confirmations.
There is very big list of trusted gambling sites which are well known and provably fair. I will not repeat which other fellows have mentioned but will write about others like satoshibet,777coin,dadice,primedice,rollin and fastbets this site is very new but admin is very trustworthy and there are lot of cool games to play something different.
Are these Instant Deposit Gambling sites? Because OP asked for specifically that.
Not sure about Satoshibet,777coin and Fastbets but I am quite certain that DaDice, Primedice and Rollin.io does not allow playing until your deposit has reached 1 confirmation atleast.