At over $ 37, this is an expensive model. In line with the Forge World Jet Bike. Certainly not something you buy 10 of. You can buy it here.
Plus, Scibor has their "Roman Legionaires" models, which are perfect for Adeptus Custodes.
There are 10 different Legionaires. You can find them here. At 87 Euros, this comes out to about $ 114 US for a set of 10.