It looks like Round Rock-based computer maker Dell is now in final negotiations for a buyout from Michael Dell, Silver Lake Partners, and Microsoft Corp., according to a report from the WSJ Monday evening. The offer is apparently worth between $13.50 and $13.75 per share. Dell has been on the brink of a deal to go private for the last week; the deal had originally been expected to be closed Monday, but apparently is still in final negotiations.