I use idrive e2. When I did the math it's yearly up front cost works out what deep archive is without an egress fee and it's quicker. In the fine print there is a fair use policy on downloads but I think it's 5x the storage amount.
Deep archive storage alone without puts is $24 TB year. idrive is $15 first year $30 subsequent. But it behaves more like s3 standard instant retrieval which is much more expensive.
Small company but have been around a long time now.