You should check all hidden terms of the hosting service as well as pricing, resources and hosting server cluster structure etc, You should also check server system OS, applications and features included with the plan. Make sure all required license, add-ons and service support included within.
When you are purchasing a Cheap Windows VPS, you should double check the features included in the plan. Double check the price and make sure that it is same on the plan page and at the checkout step. If you are looking for any specific feature/application, you should verify that the same feature/application is included in the plan you are purchasing. You should also check whether the Windows OS license is included in the plan or you need to make an extra payment for the same.