I have not found one. Typically they only sell time on big machines with 2-4 cards (or more) and even if not, the pricing is such that if you are doing anything

I have not found one. Typically they only sell time on big machines with 2-4 cards (or more) and even if not, the pricing is such that if you are doing anything for a number of months it becomes very attractive to buy outright and resell when done. The pricing scheme tells me most providers purchase when you start the lease. So for the cards and machine attached I usually see multiple grand a month. That is the trick: you need a machine with the card, and they only rent huge ones. If you just need a 2070 you could do it at home. The monthly bill would pay for the card in as little as 2mo.