I have an extra copy of the old Player's Handbook, 3rd printing, 1979.
It's in good condition, and I'd be interested in trading for it for a copy of one of the other 1st edition hardbacks in similar condition. Deities, Demigods & Heroes, the Dungeon Master's Guide with the original cover (the efreet holding the damsel in distress), or Monster Manual II would be my first choices, but I'd be open to other suggestions, including a duplicate module or two you might be looking to trade.
Please PM me if interested.