Recommend me a PDF editor/form filler?

I am currently running some pen and paper RPG games and am in search for an affordable alternative to Acrobat as I just need to fill in some PDF forms as I am using a PDF character sheet. I just need to fill in the interactive form and save its content - no creation or editing.

Anyone has any recommendation? Open-source/freeware preferred, but anything below 30 USD is fine for me.

I have not tried it, but someone recently recommended PrimoPDF to me.