I just went through the same drill recently. I assume you're looking for a 2004 AS model. If you want a 2003, then your best bet is probably CDNN -- they were carrying the 2003 (9mm) Titanium two-tone for $469.
For 2004 AS (again, assuming 9mm because you mentioned a Glock 19) the best price I could come up with was a local price of $600. I saw places online that advertised them in the $490 range, but none of them could actually get their hands on a pistol when I called. Also, some of the cheaper prices were for guns with two 10-rd mags instead of the factory 15. If you want standard capacity, figure in the cost of two mags (roughly $80) into your final price. I found that with the shipping ($25-$30), 15-rd mag replacements ($80) and FFL fee ($20), suddenly the $490 price wasn't far from the $600 + tax at my local shop. (That gun came with 15-rounders, too). Since then, I've only seen two other AS models in the shops, and they were also marked at $600. OnPoint is advertising P99 AS 9mm with 15-rd mags for $539 +$28 S/H + your FFL fee -- but they have none in stock. AK-47 Man couldn't get me one, either.
The AS models are really getting scarce...if you want one you might just have to take the plunge and fork over some cash. Personally, I'm glad I got mine when I did and I don't regret the price a bit.
Hope this helps.
Jim