Thermal sensors - please suggest

Hi,

I want to build a thermal camera, after looking at various posts seems the most popular choice is MLX90614ESF-BCI. However, this or the DCI version is not exactly cheap when you add the shipping cost.

Please suggest what other sensors with a small FOV are suitable (e.g. TPA81)?

Note : I want to use the thermal camera to scan for thermal leaks in walls, windows or other house insulations.

You've probably heard of the IR Blue project, a 4x16 camera. https://www.kickstarter.com/projects/andyrawson/ir-blue-thermal-imaging-smartphone-accessory

There is also the cheaper Omron noncontact IR sensor in 4x4 or 1x8 configurations: http://components.omron.com/components/web/pdflib.nsf/0/FF9EBCACCEA85DCD86257A4F005D00A4/$file/D6T_1112.pdf