Hey Biggie, If you haven't already checked with them look-up McFeeley's. I've done business with them for several years, great folks with excellent service. The prior recommendations are good - just make certain that your screws are of a greater diameter than the nails which they are replacing. Pulled-up deck nails often leave a tiny amount of corrosion and you will need the "bite" to go into good wood. Two products are available from Forrester Manufacturing, the Forrester Nail-Puller and the DuckBill Deck Wrecker. I was heavily involved in the development of both products.
Forrester is the manufacturer & 866-256-4499 will get you them direct, or you should be able to get either product from McFeeley's. McFeeley's will also be a one-stop shop by having any screws you may choose to order. The Nail-Puller is unlike anything else that I've seen and nails do not need heads to be removed easily. Good luck,
Otis Guillebeau from Auburn, Georgia
OPG3 Tweak everything!