Level 2 - Sawed-Off: Corleone's Compound, New York. Immediately you leave the compound through the main gate, go straight forward, and turn left. There is a hedge that can be burned with an arsonist. The shotgun is behind there.
Level 3 - Schofield Semi-Auto: Global Storage Chop Shop, Florida. Inside the small warehouse on the right side of the island. The mission in Florida must first be completed to unlock the bridge.
To get this exclusive pre-order crew member go to the 'Main' menu and select 'Options'. Then choose 'Enter Unlock Code' and type F5RE-ZYHJ-TGC2-29MG and play the first mission in Single-Player. When you then reach the 'The Corleone Compound' you will be able to recruit Tommy Cipolla.