Many thanks to all for the very kind replies. So, the Gatorskins seem very popular, and I love the idea of special tubes to add extra protection!

In terms of getting things, the taxes are not too bad, they cost 24%, this I would pay, but then there is the need for a customs agent, who will charge hundreds of dollars in fees even if I get just one tire, and often customs just keep things even so, best case it takes many weeks; in the past, yes I have ordered from the UK, but to send to a friend's uncle in the USA, and he then passes the items to my friend when he visits, and then he brings them to me when he comes home.

This is how many people in Peru get things that are not available in the country, whether it is computers or medicines or cameras or industrial devices.