I found this under help and typed checked baggage the person who started the thread is out of luck:
Are there any restrictions on how many bags I can bring?
System
posted this on Apr 23 04:00 am
We allow one personal item free of charge; and for a fee we allow one carry-on bag, and at least one checked bag per customer.
While we guarantee all customers the ability to
purchase one checked bag, any additional checked bags are based on availability.
For customers traveling to and from Lima, Peru, we only allow one checked bag per customer, and all items must meet weight and size restrictions.
http://customersupport.spirit.com/en...gs-i-can-bring