Something

SELECT * 
  FROM invusers AS t1
  JOIN invads AS t2 ON t1.invid = t2.invid invareas AS t3
  JOIN t1 ON t1.invid = t3.invid
  LEFT JOIN (
SELECT invusers.invid, COUNT( invareas.invid ) cnt
  FROM invusers
  LEFT JOIN invareas ON invusers.invid = invareas.invid
 GROUP BY invusers.invid
       ) AS t4
 WHERE t1.perm >0
   AND t2.expires > curdate( ) 
   AND t2.approved =1
   AND t3.city = 'garland'
   AND t3.state = 'TX'
 ORDER BY t4.cnt ASC ;