Hey Kiley, you can always get a set online, but if you prefer to see them in person, you can always go to the new fine arts off mockingbird and 35.
I only have 3, and I got all 3 of mine from there.
I prefer the slicker lube, as there is no tension when it goes in. It can drop all the way down to your bladder if the angle is right, with minimal resistance. I always boil my rods when I'm done, and have never had an issue with and bladder infection.
I actually have visited Miss Lindsey for some visits, and have brought my sounds to her, and she has been kind enough to offer others, or use mine. I brought my own lube, just because I prefer the consistency. Miss Lindsey is always clean, and very particular on how things should be done. I really appreciate her for that.
My personal suggestion on sounds, since there is always the risk for pushing too far or hard and causing injury, is visit someone who is experienced with it, or just purchase a sounding rod meant for this play, and attempt it solo first. There is no rush, and no need for injury. Keep your toys clean, use water based lube, take your time, and have fun.