First--click advanced search.
2--put in san antonio spurs tickets
3 (and most important)--be sure to click the box that calls for "completed" auctions only.
This way--you can read the history of all spurs tickets wherein the auctions have ended.
You will find scores of sellers who could not sell their tickets at inflated prices.
Compare them to prices where tickets were actually sold.
This gives you leverage to bargain with sellers--make them offers and tell them that other sellers who sought inflated prices were unsuccessful.
Of course--I still say the best thing is to simply go to the area close to the AT&T Arena where the scalpers put up their signs. When the game starts, the prices for unsold tickets drop down to face value or near face value.