Any place that does extrusions CAN do a "short run" of an extrusion, but you will still have to pay for probably 3X the amount of material you need to make it worth their while, and that is assuming they already have the proper tooling.
If they have to create the tooling from an example you provide, you will have to pay for them to create that, set up a machine with the new tooling, do a test run until it works properly and THEN you can get your "short run" of material done. But you will have to pay for the creation of the tooling and setup before the short run is done.
Metro Moulded Parts in MN is one place that has done things for people, try them but don't expect it to be cheap.
www.metrommp.com