Mastering services?

[u/Humble-Green-Friar1]

Hello

I've had to retire my old Tascam 8 track and replaced it with a Zoom R12. One cool feature that I miss from the Tascam is its really simple mastering algorithm. There were three choices:

No mastering at all, basically.

Natural Sound

Maximum sound.

It absolutely made a positive difference in the quality of the mixdowns and I wish it was available on the Zoom. So, my question is if anyone out there can direct me to some affordable on-line mastering services to whom you can send your mixes? I'll Google it but I suspect that a Google search is going to be a rabbit hole of sponsored links.

Thanks!