Marketplace Sale

If you head to the Mafia Wars Marketplace, you'll get a pop-up that some items are available for "up to" 40% off, including some goodies like energy refills, stamina refills, class changes, and name changes.

All Loot and Crates are discounted up to 40%.
All Special Loots are discounted up to 30%.
All Boosts are discounted up to 40%.
All Stat Items are discounted up to 30%.

Some items that may be of interest to you: 

Energy Refill

Originally priced at
10 RP

Now for 7 RP (30% OFF) 

Stamina Refill

Originally priced at
10 RP

Now for 7 RP (30% OFF) 

New Name

Originally priced at
15 RP

Now for 11 RP (26% OFF)