A roller mill is an investment that many brewers are hesitant to make; however, I have yet to meet an all-grain brewer who is not glad he/she did so after the sting of the purchase has faded. There are several nice mills that can be had for under $150.00 shipped. If you are patient, you may be able to pick up a used pre-adjusted Schmidling Malt Mill for under $75.00. Those mills are good for several tons of grain.
And Schmidling also makes an adjustable mill! I love mine.