The Marksman Repeater doesn't use a C02 Cartridge it a spring operated pistol
You must be at least 16 years old to buy C02 cartridges.
C02 12 oz cartridges of any brand will work with your 160. Basically they are all the same. You can find them at most all sporting goods stores or Walmart or any paintball store.
I assume you are asking about BB guns not Air soft guns. There are a few that fall under $50 but they are C02 not spring powered. Marksman makes a line of spring pistols under $50 but they are terrible and not worth the cost. See the link below for C02 air guns.
Wireless repeaters can be purchased from a number of retailers both online and in store. One can get them from Amazon, eBay, Maplin, Best Buy and Staples.
A great place to buy replacement ink cartridges is Amazon.com. They offer a wide variety of ink cartridges for nearly every printer on the market. It is okay to use refurbished ink cartridges, however it is preferred to buy new ones.
You can buy ink cartridges from Office Max. If you have a cartridge that is out of ink, you could pay $10 to refill your old ink cartridge. If you want to buy a new one, they have a wide selection of cartridges.
There are many different companies that make ink cartridges. Staples.com is a good place to look at for ink cartridges. They have good prices and you can buy from them either online or at their stores.
A person can buy cheap toner ink cartridges almost anywhere and most are really cheap. Office Depot is an ideal place to buy ink cartridges and Officedepot.com has them for really low prices.
Since you are looking to buy reasonably priced cartridges that are not refurbished, I would advise you to go directly to Best Buy. They carry all types of cartridges that are reasonably priced and are not refurbished.
go buy RGB cartridges
There are two places to buy refurbished cartridges, online or at a printer company. In Manchester, New Hampshire they have a company that re-sells cartridges, online you can try bestinsupplies.com.
you can buy them off eBay