In short, we do! The Rumble Go filters are available in standalone form, since they feature a universal design that should work with a wide-mouth bottle you already own. As for the Rumble Jar, the half-gallon size is only available as a standalone filter, and that's because those half-gallon Mason jars cost a fortune to ship. Plus, unlike the quart size jars which commonly come in two different mouth sizes (regular mouth and wide mouth), the half-gallon version only comes in a single wide-mouth size. So there's basically no compatability risk there. The quart-size 32oz Rumble Jar comes in both a complete kit form (which includes the compatible Mason jar) or in standalone filter form. If you're buying the latter, just make sure you've got a wide-mouth quart size jar at home (since it won't fit in the regular mouth version!)