This article is from the Rec.music.makers.bass FAQ, by Kalle Kivimaa Kalle.Kivimaa@hut.fi with numerous contributions by others.
The best source for answers to questions like this is the Bass
Player Buyer's Guide, put out annually by Bass Player magazine. It
lists nearly all available equipment, divided into instruments,
amps and cabinets, signal processors, parts and accessories, and
strings. It includes some basic information about the gear, list
price, and references to product reviews that appeared in BP where
List price is the manufacturer's suggested retail price. In actual
practice, retail prices tend to be about 20% below list price, so
that equipment is not as expensive as it appears to be.
Competitive shopping can often turn up a lot of bargains as well.
In addition, used equipment tends to be cheaper than new, although
when buying used things you will want to make sure that they're in
The Buyer's Guide lists the addresses and phone numbers of all
manufacturers who are listed in it at the back of the guide. Most
manufacturers put their addresses and numbers in their
advertisements which appear in Bass Player and in many guitar
magazines as well. Check your local music store.