No hard limits on spending, at least on non-business account. I've read too many horror stories of nice stuff that goes totally wrong and now Amazon wants $30k

No hard limits on spending, at least on non-business account. I've read too many horror stories of nice stuff that goes totally wrong and now Amazon wants $30k from you. I'd love to be able to set some hard spending limits and have all services just shut down if I ever reach them. Otherwise experimenting on Aws is very risky, particularly if you'd like to use the pay-per-use services.