[O] Price/ list comparison

I constantly buy diodes, resistors, etc. for projects and i mostly save the receipts. I want to know if there is an org-mode way (or any other software) that let's me input all the data form the receipts and tell me which components are cheaper in X store. A plus if it has a way of telling me how

[O] Where have org-latex-classes gone? And Ignore heading title but export contents

I'm getting an error trying to add my class to org-mode (add-to-list 'org-latex-classes ieeetran-class) Symbol's value as variable is void: org-latex-classes What is the org-mode 9 way of adding classes? Also, on org-mode 8 i added this hook to remove headlines and it worked perfectly, now it co