This has roughly the same pricing as Fastmail just that it offers much smaller plans. If you are really that tight about money, have your domain DNS on cloudfla

This has roughly the same pricing as Fastmail just that it offers much smaller plans. If you are really that tight about money, have your domain DNS on cloudflare and redirect mail to gmail and send from a Cloudflare worker. A bit of a hassle but completely free. Fastmail is worth it though as it has a really good web client and can do other nice things (Calendar, rules, notes, store random files, etc..)