You can get the baby eagles in the 500's. They come in the standard calibers. The .50s don't come cheap though. Try to find one used. I'm sure the previous owner didn't put many rounds through it as the rounds are expensive and not many ranges allow you to go over .45.
The baby's are pretty mean looking, but it's a 4 inch barrel vice the 5 inch you get with the .50. For the thousand dollars less you pay I suppose an inch off the barrel isnt bad. They come in either steel or polymer and do have a break in of about 300 hundred rounds. I recommend the steel in .40 if you can find one. My buddy ordered his and paid 517 out the door. That was on base though. Your mileage may vary.