Goto and request a FREE sample. They will send you a free LCD of YOUR choosing and pay the shipping. You can't beat that! One word of warning is that the LCD that they will send you doesn't have any type of leads to soldier to. You will have to attach them yourself.
If that doesn't suit you than try There you can find a 20x4 LCD for $7.50 plus $5.00 for shipping. I am using this on my Junior Project and I highly recommend it.
Try Scott Edwards Electronics, a serial LCD originally made for PIC MicroControllers, has a 232 input, about $40.00. Available from Jameco, DigiKey, or All Electronics...