"Reasonable" is a variable quantity. There are many different factors that can lead to similarly named units being sold for very different prices.
A lot of demand will put a price up in a certain area, and many available units will bring it down.
The condition of the unit makes a difference. How much money and work would be needed to make it functional? to make it ideal?
How far you need to go to get it also affects price. I might be willing to pay more for one that I don't have to drive all day to look at.
So it all comes down to looking at ads, seeing what the market for 2012 Bambi Sports looks like, and whether they tend to fall into a range that you are willing to pay within a distance that you are willing to drive and in a state of repair that you can live with. If the gap between what similar units are selling for and what you want to pay is too big, maybe looking at a larger ("more" trailer, but less cute and less easy to park, so usually cheaper) or older model would bring up units in a lower price range.