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Where I usually shop, I find russet (great for baking and fries), white (which I don't use much anymore), Yukon or gold, red skinned round, and fingerling.  That's about it.

I came across a mention of kestrel from Australia and trying to figure out what would be the best sub for this.  My aim is to make glassy potatoes. 

Looks like there are many more varieties of potatoes in Europe and Australia than in the US.  Do you find that to be true?

Sad, but I know nothing about potatoes in South America.  I cannot even imagine the varieties found in Peru where potatoes originated. 

Have never shopped for potato’s in the US but here in the U.K. (London) it’s like most things.... Supermarkets have maybe 4 standard varieties whereas if you look at independents it’s possible to find maybe 40? varieties. My main go to potato place is Marylebone Farmers market where there’s a stall that specialises in potatoes.

If these are for Annabel Crabb's recipe for glass potatoes, I have used waxy potatoes & they worked well, but the kestrel potato version is sublime. Be warned, you will be ruined for all other roast potatoes into the future - they'll never taste as good as these!

For produce in the US (if not the world), the nonpareil resource is the website of Specialty Produce in San Diego (they also have a phone app, but now charge a monthly fee). This is the Kesrel Potatoes entry:  https://www.specialtypro...tatoes/kestrel_15946.php; it seems none have been noted as being sold in the US (data is crowdsourced from users of the app, and a google map is generated). Another helpful resource, particularly in the northeast US, is the produce list at the Park Slope (Brooklyn) Food Coop (https://www.foodcoop.com/produce/). The list is updated daily, with (member) prices (assume about 75% of other NYC prices), and if it's available in NYC area grocery stores, it's likely listed here (some things only show up in farmers markets or ethnic markets that are too specialized to sell in the coop).

Alkans Cockatoo - what a great app! Thanks for the link! 

The EU potato database (!) (http://www.europotato.org/about) counts 4119 cultivated varieties and 1354 breeding lines. I would agree with 40 "findable" varieties in the UK and probably a bit more for France due to the availability and frequency of farmers market (I live between both countries).

I usually buy Ratte, Cornish Earlies, Charlotte, or the Red ones, and occasionally Belle de Fontenay, Noirmoutier, Jersey.

I didn't know about the stall in Marylebone market, I didn't even know there was a Marylebone market, but I will go and check it out (especially as I live and work near Euston, so not very far, when in London)