databender

The nitrile ones can be found at most hardware stores. If you have a nitrile sensitivity, which most people don’t, you’ll probably have to wait for the silicone ones.
If your piercings are fresh you would want silicone; if that’s not an option you could try using teflon tape on the outsides of the piercing channel maybe, or throwing some between the nitrile and the piercing fistula until they get to you (I’m just spitballing here, I can’t really imagine how that would work easily, but I’ve never tried. Teflon tape is pretty gentle on new/stretched piercings though).

Unless you’re sensitive to nitrile you should be able to, but the best ones are silicone (the clear ones). Source: worked in a body art studio for about a decade