I don't know of any online since I buy mine at a local shop. I'd look for any that mention they're implant-grade and to what standard they're compliant with. In regards to standards, I can personally vouch for ASTM F-136 but there's also ASTM F-67 and ISO 5832-3.
Congrats! Earrings feel so nice and can really help pull together a look. Anodized titanium is great and I can't recommend it enough- it's a good metal for your ears and you'll get tons of compliments!