BDL simply means it has a floorplate, ADL means blind magazine. They have made both ADL and BDL in almost every possible configuration. I've seen both with fancy walnut, cheap birch, cheap plastic, high end synthetics, stainless, polished blue and matte blue.
At those prices I'm betting he was talking about the recent run of ADL's, possibly the SPS. If they are ADL that is a better than average price for the stainless. I've seen them in blue for closer to $350. If SPS, that is a good price n both. The SPS is simply a BDL with a cheap synthetic stock and matte finish, but since they have a floorplate are worth a bit more than the ADL.
The most common higher end BDL's are running around $700-$750. Long action and short action should be the same price.