These days you can find so much information about various display case designs. It is still risky to buy something online that has not been tested and checked as it should be. For example display cases made in China will never have received the amount of time it takes to do proper quality control test.
Museum Display Cases that are made in the USA or Canada for example might just cost a little bit more but you can be sure not to have major problems with your displays.
Besides cost it is also nice to know that your jewelry and museum style display cases are made in the USA and Canada and not overseas.