I went to Congressional Aquarium this past weekend, and I was at Rick's Fish & Pet Supply about a month ago. Both looked to have decent selections of healthy plants (probably more at Congressional), but Rick's was much cheaper than Congressional. It looked like prices at Congressional started at $11.99 for most plants. Plenty of healthy looking fish at both stores, too. I suspect I'll be taking more trips up to Rick's in the future since they're about equidistant for me.