With initial $30 deposit, you can also get $100 free bet at sportingbet. Note that you need to recycle the winnings from the $100 single free bet (as well as the initial $30 deposit) before you can withdraw all the money in your account. The minimum you set to gain is ($90-$30)=$60. The moneyback amount at MBC has increased to $90 from $45 (when I signed up).
There are quite a few steps to go through (open account, deposit money, show proof of identity, bet and bet again, withdraw, possible follow-up enquiry at MBC), so it may not be worth your time and effort. Obviously not recommended for people with little self-control when it comes to gambling.
Automatic tracking does seem a little hit and miss with this offer, but enquiries have been 100% successful to date.