The most common PS plug size, often referred to as the "Boss style" since it's used on so many Boss pedals, is 2.1mm x 5.5mm barrel-type.
Wish I could help ya with the 10 VAC 500mA PS! Is it center/pin-negative, or positive? I feel your pain, I recently had to shell out thirty bucks for a boring old replacement PS, myself... !
FWIW, I found this: Numark E-PT-043-00 PS $24.95 w/ FREE SHIPPING (currently/as I type)
If the polarity is opposite of what you need, you can get a simple little in-line adapter that reverses the - and + from, among others, Visual Sound / 1 Spot.