Harbor Freight has their larger ultrasonic cleaner on sale right now for $69 with coupon code 84701607. Add to cart, enter the coupon code on the shopping cart page.
http://www.harborfreight.com/25-liter-ultrasonic-cleaner-95563.html
BONUS TIP: Tell your wife you need it to clean your wedding ring so it doesn't count towards the pinball budget.