I've run a newsletter for 6 years. Every new sponsor meant the same thing: dig up my stats, send my ad options and pricing, then trade a dozen emails more. Costed hours every month. The tools that fix this weren't built for me. Sponsy is $79/mo. Paved takes 30%. If you sell a few slots a month, neither works. Sponsonizer is free. You pay 7% when a booking closes, or nothing for $99/yr. Advertisers pick a slot, pick dates from a calendar, and pay. No account. You approve or reject in one click.