Ordered the 1" x 12" x 24" sheet.  Far from perfect cuts, but ok for the price.  Locally, these are way, way more expensive.  Therefore, Im ok with it being short by 1/4" in length and width.  Also, one edge is not even cut straight.  No worries.  At this price, its still a great deal.  Seriously, if you planned on using every single square inch of the sheet and then being shorted 1/4" inch ruined your project, then really its your fault.  Im just saying, you always have to account for your mis-cuts, loss from blade kerf, etc.  You should always allow yourself a minimum of 10% loss when estimating the material needed.  If you are doing something very intricate with difficult and complex cutting/working, then at least 25% extra should be ordered.  If you needed 12" x 24" for your design, then you should be getting larger and cutting to size.  Realize, this is a raw material.  You will have to make it into a finished product and that will involve loss of material.