You could make the values of the a-list lists, so that each key references a list
Code:
(defparameter *models* '(fiesta (ford $200 fast) focus (ford $300 slow)))
(getf *models* 'fiesta)
=> (FORD $200 FAST)
(cadr (getf *models* 'fiesta))
=> $200
(caddr (getf *models* 'fiesta))
=> FAST