King Solomons Casino (http://www.pay-fair.com/linksmanager.php?pageaction=jumplink&link_id=46) has a welcome bonus for slotsplayers:

Claim $75 on your first $50 deposit - 150% bonus.

How to claim your bonus:
1. Open your new account.
2. Visit the cashier in the casino and input code KSS75 before making your purchase of $50.
3. Your account will be credited with $75 automatically
4. Wager 15x the value of your purchase and deposit on any of King Solomon's slot machine games before cashing out.

Software is RTG - and they pay!!!