You won't receive software disks, documentation, and the license. By buying legitimate software, you will get software disks, technical support, documentation, and in many cases free upgrades. Look for a 8X or higher CD-ROM drive. If you are planning on accessing the Internet, a high speed modem is necessary. Generally speaking, Inkjet printers are slower than Laser printers but have a lower price tag and allows for color printing.
Laser printers are generally more expensive but produce faster and crisper printouts.
If you see an unbelievably low price for a computer, the vendor is most likely short changing you on one of the above parts on your computer or is taking fraudulent approaches to get your business. If you see a system that is a significantly lower than other computer stores, make sure you are getting the right parts for your money. Look for a 3 year labor or parts and labor.