Mr. Ammar's Fab Fruit's are superb, but remember that they are $20 each. I do a fourth kicker load, and that comes out to $80 for my finals... a little steep, but worth it to a working pro.
I bought fake fruit at Treasure Island for a few bucks each. Most craft or florist supply stores have them. The limes I got were rubber covered foam and are perfect, soft and silent but the lemons I got "talk" a little too much for me (I do practice with them though)