What's the Best "First Date" SEO Offer Your Agency Has Tried or Seen?

I'm curious about what SEO agencies are offering as their initial "first date" deal to get new clients through the door. Whether it's a discounted service, a trial period, or a specific guarantee, what has worked well for your agency or what have you seen others do successfully? I'm looking for ideas or inspiration for an appealing yet sustainable introductory offer that demonstrates value without being overwhelming. Appreciate any insights or examples!