Any ideas on how I can convince my parents into getting me $109 sparring set?

Well I have a karate tournament coming up Wednesday and I will be sparring.So I want new sparring gear because mine is get torn up.I was looking online and found a set for $59.95 but I need it before Wednesday,so I chose overnight which delivers on Monday,so if it came on Tuesday it'll still be okay.But the overnight thing is an extra $52.40.And i had a coupon code and it took $3 off which made it $109.35.Any ideas on how I can get my parents to let me get it?