You can catch them pretty easily too. It is cheapest to buy them at a fishing goods store, as they are also used as live bait... But they sell them by the gram, so you end up with tons of them.
I bought mine at a pet shop because I only needed a few, not hundreds.
They are really cute, and look just like cherry shrimp only aren't red. Supposedly you can sort of enhance their color by feeding them color enhancing food, but mine are just normal colored or green from nibbling on algae.
I don't know about having tons of cool stuff here - I think it is just different from what is available there. There is definitely a LOT more aimed at smaller aquariums, though. Countless small tanks, small filters, small heaters, etc, to choose from.