20" beginer cycle for 5' 3" 13 year old

Complete and utter newbie here so any help is appreciated- my son wants to join the ranks of unicyclists - i know nothing about the sport but am happy to support - anyone have a used 20" (I assume that is the right size) they would be willing to sell OR a recommendation on a cycle to purchase to to start - thanks in advance

Honestyly go to www.unicycle.com and purchase a 20" club freestyle, it is probably your best bet. Great durable unicycle, very good price. Ive purchased a few for people.

thx - will check it out