Amazon
$6.29 and free shipping -
https://www.amazon.com/TAMXF16-81716-Acrylic-Mini-Aluminum/dp/B009ACS34E/ref=sr_1_2?ie=UTF8&qid=1546304869&sr=8-2&keywords=Tamiya+xf-16
$2.72 and $2.99 shipping
https://www.amazon.com/Tamiya-XF-16-81316-23ml/dp/B0006O52I0/ref=sr_1_1?ie=UTF8&qid=1546304869&sr=8-1&keywords=Tamiya+xf-16