Hmm which skill?

spend it all on fletching supplies, fletch to 99.

then buy 99 cooking with the profits from fletching.

You won't have lost much money, so you could then buy 99 firemaking with maples, or even yews if you want to pay more to get a faster 99.

With the money left that you have, you should Runecraft nats with the money you spent on pure ess to get back your initial money.

Three easy 99s and you won't have lost money in the end