I got my trailer at costco for $99. Its the Dreamer something or other. Appears to be the same trailer that Performance sells as the Baby Transit Rumble Seat but considerably less. It came with the stroller conversion kit too. I added some reflectors and lights just for added visibility. I take my daughter grocery shopping in it since it is big enough for her and some groceries. I bring the stroller wheel with me and convert it before going in. Very simple and works well.

If you want a more expensive model check around at children's resale shops. The one out here often gets really nice trailers but they are snatched up very quickly.

You will probably want to leave the pedals on the bike. I know I need them towing the trailer and the now 30# toddler.