1) Yes. I purchase 2.5 oz bottles, which is generous enough to last awhile, but small enough to be discrete or easily concealed.

2) My favorite is Astroglide's Glycerin & Paraben Free lube, which you can get at CVS (I haven't found it at regular grocery stores). Everything else I've tried has given me symptoms of a yeast infection, but I've had no problem with this stuff. The only problem is that it gets quite sticky after drying, but that's an issue with most water-based lubes.