$1 USD (or more) for the entry-level Humble Software bundle, which includes the Home edition of Soda PDF. Also includes 6 mth subscription to CloudApp Pro (Screenshot/screen recording/gif creator tool) and $30USD Magix Music Maker voucher.
Features include:
PDF Viewer
Create PDF Files
Convert PDF Files
Edit PDF Files
Insert Page Elements
Review PDF Files
Can the app do a text 'find and replace all' search?