Bulk Photo Background Removal

I have between eleven and fifty product images that need a clean, seamless background removal. The originals are already colour-balanced, so the only edit required is isolating each subject and supplying the files back to me on a transparent PNG (and the original format for archiving)... (Budget: $250 - $750 USD, Jobs: Adobe Photoshop, Background Removal, Graphic Design, Image Analysis, Photo Editing, Photoshop, Photoshop Design)