Foam?

[miraclaire.livejournal.com]

Hi, I'm really hoping someone can help me with this.   I have a sofa that my parents made 30 years ago when they were in grad school and it desperately needs new cushions.  They are not in any way a standard size as far as I know.  (the sofa itself is 6ft wide by 34 in deep and the cushions are 5in high).    My question is, where could I find someplace (hopefully nearby) that will sell foam that they will cut into pieces for me?  I don't have a car, but in a pinch I might be able to get a ride from someone if necessary. 

Thanks in advance for any suggestions!