I have about 60 thongs and g-strings, and I have never bought them online. I live in Montreal, Canada, and this place is known for fashion. Gregg Homme is based in Montreal, and I can just go to any sex store in town and buy a GH thong. Also, there is this department store called Simons, and I have bought 2xist and JM thongs there.
That being said, I feel like there are more discounts and deals online. Also, I want to get more thong swimsuits, and I think I would have more options if I were to shop online. Some sex stores do stock thong swimsuits, but my options are limited.