Tesla sold another 100 roadster in the first quarter of 2012. This leaves 250 roadsters left to sale in their inventory. They are focusing sales in Europe and Asia for the remaining roadstes. Sales of the roadster usally pickup in the second quarter so I would expect more than 100 to be sold. Roadster sales could also be boosted by the Model S being delierved in late June. I'd suppect they will sale out of roadsters sometime in 3Q 2012. Total Sales are 2250.
Updated data is from Tesla's SEC Filing.
Update: on June 22, 2012 Tesla annouced 2300 total sales of the roadster at there Model S Launch event, that leaves about 200 roadster left to sale.