The box at the upper right of the image with red text is the current SELL orders - people wanting to SELL their VOID for the price listed. These are prices you will be guaranteed to be able to buy VOID at. However, if you are buying a large number of VOID you may not want to buy up all the SELL orders, as the price may escalate very quickly. If you have the time, it's worth setting a reasonable BUY limit trade order and waiting for someone to sell their VOID at your asking price.