Baker Creek Heirloom Seeds is offering free shipping for 6 months if you register tonight. Their seeds have an exceptionally high germination rate and customer service is a 10. Best of all, they ship to PUERTO RICO, even the live plants will ship free if you register in time.
If for some reason you miss out on this deal, it’s still well worth a try since shipping is very economical compared to other vendors.
I am not affiliated with the company, just a huge fan. :)