J.B.
my sister passed on a plastic type potty chair that was a chair that actually sat on the floor. my daughter disliked it b/c after sitting for a while it would really leave creases in her legs and on her bottom. she wasnt interested in using the potty b/c the potty hurt she said.
so i actually got for 10 bucks the seat insert for the regular toilet. they are padded nicely and have sesame street or dora figures on them. and then sit down right into your toilet and some have handles on them or a spill guard in the front for boys too. i paired that with a stool at the bottom of it so she could get up whenever she needed.
we just ALWAYS had to remember to put the potty seat back whenever us adults were done using it, b/c one time she fell in and was scared for a while again. i ended up getting a second seat so i always had one in each bathroom for her and didnt have to run up and down. they were readily available when she needed. and easily cleaned and thrown in a plastic grocery bag to send along to the baby sitters.
i hope you find something that works for you guys!