I bought my press on Amazon for around $25.00 and well worth the price. The bran I happen to get is a Victoria 8 inch cast iron press. I not only use it for tortillas, but for pressing out pie crusts for my miniature pies and calzones.
Mine is made of cast iron and does a good job of pressing the tortillas. The only issue is you still need to roll the tortillas to make them larger, but it does give you a good start.