Roam's site[1] only mentions $165/yr. The 5 year plan is $500, but then... if you stop using it after a year, you would have paid $500 for 1 year of usage. If you're thinking of no lock-in, you need to see the monthly price, which is $15 month, way more expensive (for personal use) than anything notion has (free/$4/$8 per month)
[1]: https://roamresearch.com/