Replying to How to buy skis without a credit card or via parents...?

ok so i have this lawn mowing job, and it pays pretty well. i have enough to buy some new KF layzrs since they're 50 percent off, which is a steal. so how do i buy these without my parents knowing or using one of my parents credit cards? could i just send an envelope full of cash? maybe an envelope with cashiers check or whatever? someone help, i need these skis before the sale comes to an end.