Sorry to say, if you don't have the capital to pay for a fancy all over print, you should concentrate on something more standard. There is a reason why all over prints have a minimum, and that is due to time, money, and effort the printer has to take for them to accomplish an all over print for such a small run.
Perhaps alter your design to just be an "oversized" print that will print large on your shirts instead an actual all over print.
Perhaps alter your design to just be an "oversized" print that will print large on your shirts instead an actual all over print.