Have you tried the Berman dilators? They vibrate and you can work your way up the sizes. They’re a four piece set and are about 20 dollars on walgreens.com

I also have this: https://www.amazon.com/dp/B000BIPK10/ref=cm_sw_r_cp_api_ATUYzbQ1VQ1PE and I like it a lot. It’s about an inch wide.