Saving steam cart

I almost read what you had to say.

As far as I know - nope. You'll have to buy chosen game with current price.

I don't think so. The price in your cart is the same as the price in the store, regardless of when the game was added to your cart.

No, it will say that one or more objects in your cart have changed price since you added them then ask you if you want to continue (the prices will then update).

"If using a payment method that directs you to an external website (such as PayPal or WebMoney), you will be rerouted back to Steam after filling in your billing details. This will confirm your purchase."

That states that Steam sends you to PayPal then back to Steam to confirm before the purchase is complete. If that is the case, then it's more than possible for them to change the prices.

Haha.
I remember doing this when i just created my Steam account.

Short answer: No.

Long answer: The price is always taken as the price of the moment you confirm the order on steam, this goes both for a discount ending and beginning. After that all you have to do is pay in the time allowed.