You can buy them direct from the Lexus car retailer either in store or online. The online stores include many independent retailers offering various prices, or you can of course purchase these direct from the Lexus car retailer itself. It probably depends on price and availability.
A cheaper alternative to BMW branded floor mats is to simply by unbranded floor mats at a local store or car dealership. Floor mats for cars can also be find online for cheap prices.
Nifty floor mats are floor mats that go on the floors of vehicles. They can be found in many auto parts stores. They can also be found online at sites such as eBay and Amazon.
Online floor mats are not that common and I have never heard of embroideries on floor mats. Perhaps a specialty retailer will do a custom order but I am not sure.
One can find Harley Davidson floor mats in antique shops and pawn shops, as they are somewhat collectible. One can also find them online on sites such as EBay.
For specific Honda floor mats, your best bet is to order them through Honda directly, the dealership site, or salvage yards. Most aftermarket floor mats are universal and can be cut or modified to fit. You can find a wide selection online at Walmart.
Overstock.com is a great place to find cheap floor mats with many to choose from. Aliexpress.com also has inexpensive floor mats to fit any budget. Walmart is always a good place to for great prices and they usually have a wide variety.
WaterHog Floor Mats are manufactured by The Andersen Company. WaterHog Floor Mats can be purchased online at NexTag, CommercialMatSource, and XPressMats,
Home Depot sells floor mats and cargo liners online and in store locations. To find a location closest to you visit their website and use their location finder.
You can purchase all weather floor mats from Amazon, Weather Tech, or Auto Anything online. You can also find them at any local auto parts shop as well.
You should check out Pinterest. They have step by step instructions for many different do it yourself floor mats. They will also provide a list of materials you will need.
Seatcovers.net specialises in custom floor mats for your car or truck. They're based in Mesa, AZ. You can go to your car dealer and ask for floor mats. They will most likely have floor mats available for sale.
There is a website called "www.customfloormats.com" that customly design mats of all sorts just the way you like them; starting at $59 and up, even your own design (how cool is that?).