anybody have a infiniti fx45 engine for sale

Why not check local wrecking yards for an engine. l am sure you could do a search on the Net to find one.

FX45 is a part of Nissan is FM platform, & it would most certainly be easier to find a VQ35DE that is compatable over the original VK45DE. That does not mean it will be easy, or cheap, since both engines r relatively new & the VQ is very popular with the racing world. The searches l ran for the most part came up with the easier to come by CA18DET & SR20DET engines which l doubt would be compatable. You're best bet is to use the engine codes & search with them. VK45DE is the engine that belongs in the FX45, the VQ35DE SHOULD be compatable because it is used in all of the cars that r a part of the FM Platform, including the FX35.
After further searching l came up with a few results for the VQ35, as well as one VK45.

http://asapmotors.com/infinity-fx45-45-p-5176.html

http://asapmotors.com/nissandatsun-350z-35-p-5160.html