It's made by NB engineering and is/was a lot more expensive than I thought $99. I payed nothing for mine, it's included in BN kits!
Here it is anyway: http://www.nbengineering.net/accesories.htm
Looks like the Budd option is just fantastic. It's adaptable, it's light, you could do the right thrust modifiction trick to it and it's super cheap.
Dosen't get better than that does it?.