Win them in a comp, win them in a raffle, work at a ski shop, present, compulsive buy that you can't afford, bought them for next season got a ticket and need cash, stole them from your roomate because he had sex with your gf......the list goes on and on.
You just give them money through pay pal, and they send you skis, or they can request money from you and you can accept. Or money orders, personal checks, meeting in person and paying cash, it isn't like there is a set way.