Those quads are still produced, for this year they even have a "new" model with some small changes.
The front-end is designed so that the wheels do not scrub. And the rear-end has 2 shocks.
At an average mx-race these quads are about 25%-50% of the starting grid. They hold up realy well, I have never seen any of them break.
The MSRP on one with a CRF450 engine is 17.000 Euros, thats close to 25.000 Dollars.
However, the Cannondale Moto had a MSRP here of 16.900 euros.
http://www.w-tec.nl/starteng.htm