Over the past several years, the Birkin bag "waiting list" has largely become a thing of the past. But keep in mind, just because just about anyone with at least $10k can buy a once super-exclusive Birkin bag these days, that does not mean that authentic bags are readily available at brick and mortar stores or online. Can you find and/or used Birkin and Kelly bags online? Yes, but it's pretty risky. First of all, Hermès does NOT sell online. A such, any "new' bags being sold online will come from secondary sources. Sites like Moda Operandi and Heritage Auctions play online host to the sale of authentic vintage Hermès bags from time to time, but I think is where we can safely draw the line because at the same time, sites like Moaat.com and many others exist, offering bags with authentic-looking images and hefty price tags (which are priced this high to seriously confuse consumers), but I promise these bags are far from real.
Given the rise in popularity of online consignment shops, many of which seem completely legitimate, the risk of purchasing an inauthentic bag is also greater. While many of these sites assert that they employ individuals to ensure that "every item sold is 100% authentic," which they very well might, I am still a bit skeptical. Here are a few other universal rules in case you are going to risk it and buy a Birkin from a non-authorized dealer …
Birkins and Kelly bags are virtually never sold at a discount, as the bags do not really depreciate and also due to the continuously high demand for them. So, if you see a bag "on sale" or "discounted," this is a red flag. Even vintage bags that are being sold "as is" and on a final sale basis can run upwards of $20,000 depends on the materials. The of the less expensive vintage Birkins I saw recently (it was made from epsom leather, as opposed to prorsus crocodile leather or ostrich leather, and was smaller in size) sold for over $11,000.
Another rule: Much like the price tag is not always an indicator of authenticity, as they can be fakes, photos are the same. Don't judge a bag by the site's images. More frequently than not, these legitimate-looking sites use real Hermès photos, not ones of the actual bag that will be shipped to you. Also, don't bank on the notion that you will get a refund if you order and pay for a bag, receive it and don't like it and ship the bag back. If you have ordered a counterfeit bag, there is almost no chance you will be getting a refund or even a response to your email.
The lesson here is this: Even if the website is charging authentic Hermès prices (or close to authentic Hermès prices, they're a bit cheaper on Moaat.com, for instance) and the bag looks real, that doesn't mean it is authentic. Moaat.com and numerous others are in clear violation of the Lanham Act (which provides the grounds for trademark law), as it is involved in serious trademark counterfeiting. When shopping for an Hermès bag, only buy from authorized retailers, and with only a few online exceptions, this means an Hermès store.