I would agree with the essence of the answers above. I have two second hand laptops in use, one i7 and the other i5, both are Dell e6420. The former has a camera, the other not, both have a DVD drive and both have an SD slot. They do all I want and can no doubt do more besides. Each cost me well under £100 on eBay but you regularly get them for around £130-150 provided you are prepared to accept some blemishes. They, particularly the i7, got good reviews at the time they were launched.