I don't know if this helps but I used to work for a fragrance counter and would trade testers I got for photography; we traded equal amounts, dollar for dollar. My hairstylist right now is a guy so I trade massage with him (I am also a licensed MT) and we also trade dollar for dollar. Quick tip...at least in Texas, if you say "trade" you don't need to pay any taxes on it but if you say "barter" (I hear this alot) then you are legally required to pay taxes on the services rendered, even if money never changes hands. Semantics are strange when it comes to the law.