Google Fi is having a half off sale on new Pixel 3 phones if you purchase and activate on Project Fi within 30 days. The terms only mention activation so you can likely cancel in a few days and get a pro-rated refund on service. Pixel 3 starting at 399 and XL at 449.
https://fi.google.com/about/phones/#pixel-3
https://fi.google.com/about/phones/#pixel-3