I can get grass fed beef here in Alberta for $4.50/lb cut and wrapped (so $450/100 lbs) so your price is a bit high to me. I get pastured eggs for $5/dozen. Even though it is a little on the high side I would always encourage supporting local, small scale farming.
I visited Cognito Farm during "tour de farm" day sponsored by Slow Foods First Coast and was very impressed with their farm. Clean, well-run, high quality. I buy eggs, beef and chicken from them. I do not know if they offer this at their farm, but when they come to market in St. Augustine they also offer some goat cheese products, made from raw goat milk - very good, that they bring from a Glades Ridge Goat Farm.
depends on the cuts, that sounds about right though. ground beef is usually 5$ a lb or so. steaks usually 6-7$ and the filet mignon cuts are sometimes upwards of 20$. so 600-750 sounds like a fair price. not cheap, but fair.