I was at the Starbucks Shop located within the Red Lion Hotel in Elko Nevada on Sunday October 15, 2006 at 3:45 pm, where I orderd a grande size green tea. I gave my Starbucks credit card for payment. I know that the last time I had used the card it had a little over a $21.00 dollar balance. The female clerk taking my order and card fidgeted with the credit card computer which was a separate device from the computer cash register. The tea cost was a $1.81. I asked for a receipt which indicated I only had a $3.99 balaance. I did not have the previous receipt so had no evidence to present with which to argue with the clerk about my drastically redeced balance. I believe she deliberately shortchanged me but how it could benefit her, I have no explanation as I am not versed in how that may have been accomplished.. I am only bring this to the attention of the Starbucks Corporation in the event this is happening elsewhere and they may stop it before we, as consumers, loose confidence .