Overland "Badging" - Birthday Gift Help

So, I am aware that it is a trend amongst some offroad/overlanders to put the flags of countries they drive in on their cars. Fine....but the USA, Canada and Mexico are massive and geographically different. You can’t tell me that Texas and Alaska offer the same offroad driving.

I’d like to get my Dad, who is currently off roading in Baja California, Mexico the state/provincial flags of places he’s driven for his birthday next month. Does anyone know of a place you can find or custom order flags of a uniform size?

I’d be looking for the following flags: British Columbia, Washington and Baja California. (As an aside, the WA flag is..... not the best in the union).

I’m guessing the Baja California state flag will be the toughest to find