If you go to the website
www.dermablend.com and go to store locator, you can pinpoint what might be closest.
Here in Texas: Macy's, Dillard, and Jcpenny sells the stuff. It depends on what product as to the cost.
A tube of the liquid paste stuff costs about $25. I went to Macy's and they did the match. (Remember the inside of your arm is lighter than the outside, so dont match the top of your hand.) But she gave me a couple of small sample tubes...I only use it when going out to a social..or larger gathering...oh wait I dont go to large socials...lol...anyway...the small trail has lasted me some time.
And another sugestion is calling or writing the company. They usually can send you a small array of color samples that are in your tone range.
Good luck,
Rain