This article is from the Magic FAQ, by Paul Nielsen firstname.lastname@example.org with numerous contributions by others.
It's amazing what people will say for money. The trouble is that you'll
find a lot of misleading but correct ads in a strict legal way. Look
for reviews of the items before you buy. Go and watch a demo, and then,
if the demo looked wonderful, you need to have someone tell you whether
this can be done by someone at your skill level.
Suggested questions: Do you really need this item? Is it useful in more
than one way? Or is it limited to the effect described? Will it gain in
value over the years? Is it a limited edition? Will it help you in
your act? Do you plan to USE it?