I have a Intuos and a bamboo (got the bamboo 2 years ago in birthday and brought the Intuos myself) But I really want a cintiq. I know it may not help me very much more than the other 2 tablets, but I need a tablet I where I can see the screen. I have problems with my back and need everything that can help me the most possible. And if I shall use my tablet I have not it will only make it worse since I shall use my computer to look on the screen and it will hurt my back even more. I do most not look for a cintiq to be a better artist. I look for one to help myself.
Well this does present a quandary. You didn't tell us much other than you wanted something inexpensive. The short answer is that you're not going to find a "cheap" Cintiq. It is next to impossible to find a Wacom Cintiq for less than around 750 dollars. (I'm speaking of the Cintiq 12wx which is the least expensive one which retails for abour $817 on Amazon.com) Even on Ebay, people aren't selling them for less than that amount unless they're broken.
I don't know how much you want to spend, but I can give you about the only options for the type of drawing device you're talking about. Yiynova makes a couple of products that might interest you.
that's a 10.1 inch USB digitizer tablet. It's $299 and it is basically a USB monitor with a digitizer underneath it. That's going to be about the least expensive option for a new piece of equipment.
If you're not opposed to buying used, you might want to do some searching on Ebay for A Motion Computing M1400, LS800, LE1600, or LE1700 tablet. these are Windows tablet PCs with wacom based digitizers. They only have 256 levels of pressure sensitivity, but you are able to see the drawing underneath your hand like you're used to.
You can find a few of the ASUS Eee Pad Slate EP121s on ebay as well for around $600. If you don't mind Android, you can look at the Galaxy Note tablet, or The Lenovo Thinkpad T2 tablets --both have stylus's and are around $5-600. Android has a few drawing programs that are pretty good, so an Android tablet might be a solution. Adobe makes a version of Photoshop for the Android Platform, as well as Autodesk Sketchbook