Some Ampeg bass amps are on sale at Musicians Friend. Those sale prices stack with an Ampeg rebate that runs for a couple months.
My favorite deal here is the Ampeg BA115V2 1x15 Bass Combo Amplifier [musiciansfriend.com]
$399 on sale $324.99 - $75 rebate.
is the list of amps with rebates on sale. The higher watt amps have a bigger discount and rebates also vary the same way.
Rebate values range from $30 up to $100 for 10", 12", 15" and 2x10" models
Rebate Here [musiciansfriend.com]
I don't care for rebates but some of these deals are fantastic if you are wanting a bass amp that can be heard over a drummer. The 15in (maybe others too) can be tilted to use as a stage monitor for bass guitar.