Should i keep saving my $ for a car or just buy 1 thing that i want?

i have 2100 saved so far for a car, im 16 right, so me and my sister really want a trampoline like really badly for a while now, id be willing to buy it myself they run 250-350 I figure it'd be like buying a gaming system like a x box or something, so should i keep saving or buy the tramp?