请问这样的二手笔记本值多少钱?谢谢IBM Thinkpad A20m Processor Type PIII 700MHz USB 1 PORT Display 15" XGA TFT Active Matrix Floppy Drive Included Hard disk size 11GB Memory (RAM) 128mb CD-ROM Included, 24x Fax/modem Included, V.90 56 K modem, Internal Network Card Included, Internal