Easter egg: Put "seed" after your surname on the sign-up form and it'll use a seed whitelist I just made.

I believe this now makes you the cheapest subscription monthly order seed service. You might have some trouble marketing this angle though, what with the hysteria over seeds from China right now.

Can you please recommend other similar services?

I only need that from spring to summer. My greenhouse isn't setup yet.

I'm afraid I can't, I haven't used any of them.

From googling there appears to be quite a few, both curated and otherwise, what I saw ranged from $3 per shipment to $15+