Cheap tweaks...What would YOU reccomend?

I haven't slogged through all of this advice so forgive me (please) if I am repeating someone. I was looking at the mapleshade catalog and saw something like tepee's supporting cables, to get them off the floor. They wanted too much money but I spent a few bucks on dowels and wood glue, used up a few old rubberbands and made my own tepee's.
Total investment: under $10.00, and four hours of time (not all at once either).
Result: added clarity.
Worthwhile endevor? Yes!

I saw those sheets in a store a few months ago. The guy told me he helped develop them (along with every other technological advance of the 20th century). He was full of something...
He was suggesting thier use inside equipment. Does anyone have experience with using them inside??? Since the salesman I talked had so badly damaged his own credibility I did not really listen to his continued rambling. His being crazy does not change the possible effectiveness the these sheets though.
WHere are you buying these sheets?