Projecting images actual size

I have seen the software ProSelect, that does quite a lot. However there is one feature that I like the most, that is being able to use my projector and display an 8X10 actual size on the screen to show a client how small that is. I really would like to find something not so expensive since that is really the only thing I am wanting to do. Any suggestions?

A number of variables come into this, not the least being your projector throw distance and aspect ratio.
You will also need the image width at the throw distance and the size of the source image in pixels.
http://www.projectorce​ntral.com/projection-calculator.cfm may be of some help as will be the projector specs.

Once you have these, some simple maths will produce the image size in pixels required to produce an 8" wide image at the viewing distance while an image aspect ratio of 1:1.25 will ensure it is 10" high.

You could just go to Walmart and print an 8x10 or two.

Nikon Coolpix S1000PJ? Since you're talking about "not so expensive". Not very user-friendly though, for your purposes.