Question about negotiation

I applied late, and am therefore getting my decisions late.

I have pretty much narrowed my choices down between two schools, Seton Hall and UPitt.

Seton Halls deposit is due Friday, while my admissions packet from Pitt likely wont show up until Friday. Could I put down a deposit at SHU and still use the money I get (hopefully) from Pitt to ask for more money, and vis versa?

ask for a deposit deadline extension

I did, but theres no guarantee.

if they gave u money they will most likely give you an extension

They did, good call.