I keep getting traffic to this post from people searching for 'Google Play Jersey' or variants of that query. It's no help finding alternatives to Google Play though. There are at least two I know of that anyone in Jersey & Guernsey can use, and as an added benefit one has entirely free and open-source apps. The other gives away a paid app daily, and is a big company known for excellent customer service.
I was frustrated months ago when I tried to purchase paid apps from the Play store and got the dreaded 'not available in your country' error. It's possible Google have decided to ignore the small market here to concentrate on tax dodging and plausible deniability for privacy violations instead. Just a wild guess based on their well-documented past, no idea if it's true. Ready to upgrade to a better store?