where is his shop and from where he can send it? I mean if you buy cams for yourself is one thing, if you buy cam for a client installation thats another. The second case you are dead if you dont have a local distributor and local quick warranty. Hope its clear now.
If you're doing an installation for a client (or multiple clients) and the client(s) require more than 1 camera then you could effectively provide the warranty to your client yourself
Based on your earlier comment about distributor in England... using current Bank of England € exchange rate of 1.12 and $ exchange rate of 1.3, and ignoring the necessary mounts and nvr
5231-Z From Spain €231, ~£206. From Andy's Aliexpress site, $170, ~£130.
SD49225 From Spain €469, ~£418. From Andy's Aliexpress site, $332, ~£255.
2 of 5231-Z + 2 SD49225 from Spain would cost £1250
3 of 5231-Z + 3 SD49225 from Spain would cost £1158
So, you could purchase more cameras than you need for less money. If there's a faulty one, you have a spare and could swap it out immediately. Charge your client based on the Spanish prices and give your own warranty.
I know what I'd do. (Also, if you email/pm andy then you might get a slightly better price than what he offers on his Aliexpress site, saving you even more money)
Disclaimer: I'm another satisfied customer of Andy's. Andy's delivery to the UK to me took about 3 weeks to be received which, for me, was perfectly acceptable.
I've tested them but I've still not installed them. Just never seem to have the time. Maybe this weekend.