We have had a few people this week state they are getting this error when trying to check out:

"Unfortunately one or more items in your cart can't be shipped to your location. Please choose a different delivery address."

This is due to the weight of the order.  USPS limits packages to the weight of 70lbs.  If its over that it will not process.  We are working with the cart people to get a solution to this where USPS doesn't think the order is one big package.  We were told this won't be fixed for a probably a month though.  So the only solution we have now is when you place the order and you get this error remove an item or two until it allows it then place a second order for the other items.