Always interesting to see how people vary with regards to their spending. If you are willing to say of course.
Me? $6.99 AUD. There was a special going on and that offer gave me enough Ironite to be able to buy a 10 pack of rare souls. This was back in October time. Best character I got was a dupe SOL Eddie. That and learning from the mistakes I made playing Star Wars Galaxy of Heroes made me doubley sure not to spend any more.