There are still a few guys around my area that still bob around with their ultralights. Most of em are Quicksilvers from the 80s and early 90s. Every now and then one of those will come up on the market...I want to say for around $5000-7500. Condition varies on em though...I know one for sale locally that is only $1500, but they guy stores it outside so it's just absolute trash.
Like Cazzie said, they have a very low wind tolerance level. This keeps most of em up here in ND grounded most of the time...it just never "not windy" up here.
I've kicked the idea around many times, especially since I'm a snowmobile nut and I know the Rotax engines inside and out. But the too much wind conditions keeps stomping that idea out of my head.
I'm still looking more seriously at the light-sport ticket too.
An old fellow that was a flying friend of my uncles and grandpa still has a Luscombe sitting in the hanger at his farm. He's too old to fly anymore and his two boys don't have any interest in it. I still keep in touch with him and I just might wind up with that thing someday. It is fairly low-time (both airframe and powerplant) and needs minimal work to get it back in the air...plus I could get it recertified as LSA.
This is one I'm thinking long and hard about. Vintage wings, all-metal, LSA capable...just what I'd love to own. Especially since all the work of getting a medical sign-off for my Type 1 diabetes threw an extra curveball at me ever getting my PPL a couple years ago.
I know older Luscys can go for around the $15K range in basic configuration...which isn't bad compared to the pricetags on the newer LSAs.