Least Expensive invitations w/out DIY

I've looked at a few sites..so far ther most inexpensive ones I've found are very simple and about $39 for 100 invitations (not including all the other stuff, of course)
has anyone seen anything less expensive at a store or another site? I don't mind if the invitations are very simple..trying to spend as little $$ as possible without printing them out ourselves...tia!