Cheaper sex dolls are inflatable, using air. These dolls, representing the lowest price-range (less than US $75), are usually made of welded vinyl and bear only a passing resemblance to actual people. They have an artificial and typically crudely designed vagina or penis, but due to their affordability many users are willing to overlook their shortcomings. They often burst at the seams after a few uses, although they are commonly given as gag gifts and therefore many may not be used at all. In Russia for some years the Bubble Baba Challenge humorously featured participants river rafting on blowup dolls as a matter of entertainment but in 2013 the race was cancelled on "health and safety" grounds.[10]
It’s also way cheaper. For many of us who are starting on our sex doll adventure, TPE is the best choice in many cases, since often, you might not have the money or a silicone doll. Silicone is super expensive, and it definitely is something that you might have a problem with. With TPE, you can get a sex doll and learn to experience it, and from there, you’ll be able to eventually get another doll if you so like. Obviously, it isn’t super cheap, but if you’ve decided to commit to a sex doll, and you’re still unsure of if you want to have a much more expensive option or not or you just don’t want to wait, then definitely consider the idea of going TPE with your choice, since it can definitely help.

Now, TPE stands for thermoplastic elastomer, which is essentially a mixture of polyvinyl chloride and silicone. This is a type of skin that is very soft, and it mimics the feeling of human skin. TPE is way more realistic in feeling and it definitely mimics the feeling of human skin. It also is much cheaper than silicone alternatives, sometimes even hundreds of dollars cheaper. TPE also allows you to move the doll around in various ways, since it has more flexibility. TPE dolls don’t really need to be bathed, but you can, just be mindful of the water. It also is hypoallergenic as well. 

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