You should check out the local clubs if you haven't already.
SFBAAPS is the bay area plant club and has really cool people with many different plants. You can join at sfbaaps.org by joining the forum. The meet dates are also posted on the forum.
Also there is SVAS and there are some people who bring CPD's occaisonally which go for decent prices. Maybe ~$8 for a bag of 3 at times, but it really depends on who is there and if a lot of people want them. They meet on the first saturday of the month. Topics are posted at there website siliconvalleyaquariumsociety.com and I believe that January's is supposed to be an aquatic plant talk given by Tom Barr.
Hope this helps,
Last edited by bacon5; 12-26-2012 at 11:39 PM.