Vector Builder is a really useful free online tool where you can design (and purchase) a custom-built vector with a few clicks. In three steps you could design your expression vector, or order targeting vectors and Bac modification vectors. Selecting your requirements in Vector Builder you can construct your vector and the map will be displayed.
The available options are: expression vectors (custom design), targeting vectors and Bac modification (with a verbal explanation of your desired features in your vectors, the company will design it for you and give you a price cuote). Once you have selected the expression vector, you could choose a broad combination of applications, vector backbones, number of genes (from one to four) and the selection marker.