Another site worth looking into is SecretBenefits.com. Here you purchase credits, rather than a subscription like SeekingArrangement.com. I have run into more scammers on SB, than I have on SA, but there are still some pretty young women that are willing to fuck for an allowance.
You can get 200 credits for $89, and it takes 10 credits to message a girl you are interested in, so it will cost you $4.45 to message someone. Not all will write you back, and many have not been active in a while, so I would suggest you don’t write anyone that has been inactive for a week or more.
You cannot write nearly as much on your profile as you can SA, but you can always include more about what you are looking for in your messages. I prefer SA over SB, but SB is still useful.