The Shop sells exclusive, limited release items, and normal items. However, the items are not bought with in-game money. Users must use credits to buy items from The Shop.

Current Credit Rates

100 Credits - $5.00 USD
200 Credits - $8.00 USD
500 Credits - $20.00 USD
1,000 Credits - $35.00 USD
2,000 Credits - $60.00 USD
4,000 Credits - $100.00 USD

There is also a possibility to buy Credits with in-game money. To do so, you will have to buy them from another player that already purchased said credits for real life money. The transfer itself will be done by AdminPwn (ask nicely ;-p ).
The in-game price varies, although there have been reports of 500 Credits being sold for $100,000 in-game money.

Items

The shop sells some of the rarest items in the game, including the Katana and Grinder chainsaw. While both can and have been found, it is much more simple to buy them from the Shop. While items can be bought in the Shop, there are some which you can only find in your exploits in the inner city, like food, medication, misc items, as well as weapons and armors.
The Items available in the shop are:

• Low Level Equipment, encompasses the 50-100 Credit range.
• Medium Level Equipment, encompasses the 150-500 Credit range.
• High Level Equipment, encompasses the 500-1,000 Credit range.
• Elite Level Equipment, encompasses the 1,500-12,000 Credit range.
• Every kind of ammo in Dead Frontier in amounts of 300 rounds per purchase.

Miscellaneous

The Shop sells an exclusive stat reset for 500 credits ($20 USD).

Elite Shop

The Shop also contains a mysterious section called the Elite Shop. Currently, the Elite Shop is the only place to buy the powerful Dusk weapons, the Razor, Kris, Mesh and Enforcer. The Elite Shop is available to the #1 survivor and player killer of a given week, and the items inside are bought with in-game money.

Exclusive Items

The Shop occasionally sells "Exclusive" items that are only available for a short period of time. Here are the exclusive items:
Dawn Razor
A unique item available from the game's release until May 20th, the Dawn Razor has the same damage and statistics and damage values as a normal pen knife; its advantage is its 8/8/8 Master crafted stats that will constantly boost your stats.