If anyone's still looking for him, SS Sideswipe is available from Amazon US for ~$31 with free shipping over $49 for Prime members. Only 1 left in stock.

https://www.amazon.com.au/dp/B07DJZH..._8WisFb2VXGA2Q

Only a day after I paid 40 to an FB seller for one too.....

Edit:- and gone....