My name is Sam.And i would like to do the rasberry pi portable project but I don't have a 3d printer can you sell the case. 
I am sure if you contact a fabrication service in your local area they should be able to 3d print/Laser cut a case for you, in that case you would need the appropriate files.
If you want a 3D printer for a low price, try the Printrbot Simple, a cheap but high quality printer.
Not many people may wish to sell you a case for many reasons, so check out services in your area.
If this helped you, then mark your question as answered and leave a like 
thanks but im 11