ColorSeal
Bryan,
We can match any grout manufacturers colors. All we need is the name of the color and the manufacturer. For example, you can go to Home Depot, Lowes, etc or any place that sells tile and get a grout color chart. This is the cheapest and easiest way to get going.
I do encourage doing a sample on the custy floor - because it really helps sell the job ( this would involve about a $75 investment). We have a very specific sales pitch that we use that is not aggressive - all we do is demonstrate what each option looks like and explain the pros / cons and 70% of all our jobs turn into CS. We even ColorSeal most of our new install work. If you or anyone wants more info on this let me know.
If you do a demo in a custy house you can remove the product with a high ph cleaner and a little bit of elbow grease.
If you are interested in doing 600sf + some counters you should order 2 pts of product and about 10 chamois. You did not give tile size - so I am assuming 12" tiles on floor.
If you decide to do your house make sure that you talk to me before you start the job - I can help you get going over the phone and save some time and aggravation.
Good luck