If you don’t mind not having an applicator (and in my experience you can get a much better fit without one), try the smallest size of OB tampons. They don’t seem to expand as much as other tampon brands- just enough to fit well without really lengthening at all- and since they’re rounded at the tip they’re more comfortable.
Also, since they’re individually wrapped in plastic and tiny, you can hide some extras in the spa robe pocket in case you need them.