You should try DBordello service at www.BTCPak.com
The site seems to be having an issue this morning (actually half the internet seems to be doing that to me) but his service is really nice and simple.
Step 1: Goto www.BTCPak.com
Step 2: Select your MP ammount (currently $100 only)
Step 3: Send the coin total to the address provided
Step 4: Wait 6 confirms or send via the MtGox Green Address for INSTANT delivery
Step 5: Use your MoneyPak