New Redemption Grab Bag now includes an assortment of 500 cards from five (5) different expansion sets. Available at Cactus website.
Actually, NJ site doesn't discard itself after 2 rescues...Kirk
What gives you that idea?
Access sites return to your territory at the end of battle unless the site card specifically instructs that it be discarded (e.g., Promised Land).
On another note, I disagree with Polarius. NJ specifically says "This Site may be used for no more than two rescue attempts per game." Sites are generic, so unlike artifacts with per game usage limitations (eg. Holy Grail), which are unique, usage of one copy of NJ has no bearing on other copies.