The Yoga Passport is a good way to explore many studios cheaply.
The MindBody Finder lists many studios in the area by distance and class time… a great tool if you are looking for a class TODAY and don’t want to go through all of the studio websites.
There are several online sites that will stream yoga videos right to your computer if you can’t/don’t to leave the house… I haven’t taken all of these classes, obviously, so cannot vouch for them personally, but check some of these out if you are curious: