market.sty

\newcommand\mkPrice[2][sp]{%
  \randomtwo%
  \randomthree%
  \randomthreeC%
  \randomfour%
  \randomdozen%
  \setcounter{track}{#2}%
  \ifnum\value{track}<4%
  \else%
    \addtocounter{track}{\value{r2}}%
    \ifnum\value{track}<14%
      \addtocounter{track}{\value{r3c}}%
    \else%
      \ifnum\value{track}<34%
        \addtocounter{track}{\value{r4}}%
      \else%
        \addtocounter{track}{\value{r12}}%
      \fi%
    \fi%
  \fi%
  \ifnum0<\value{track}%
    \arabic{track}~\glspl{#1}%
  \else%
    \textit{free}!
  \fi%
}

\newcommand\marketItem[4][sp]{
  \ifodd\value{track}%
    \randomthree%
    \randomfour%
  \fi%
  \randomdozen
  #2 &% Name
  #3 &% Weight
  \mkPrice[#1]{#4} % Price
  \\
}

\newcommand\rareMarketItem[4][9]{%
  \randomize%
  \ifnum\value{r12}>#1%
    \marketItem{#2}{#3}{#4}%
  \fi%
}

\newcommand\showArmourPrice[2]{%
  #1\expandafter\MakeUppercase\armourName & \arabic{armourDR} & \arabic{covering} & \arabic{armourWeight} & \mkPrice{#2} \\%
}

\newcommand\rareArmour[3][9]{%
  \ifnumcomp{\value{r12}}{>}{#1}{ \showArmour{#2} & \mkPrice{#3} \\ }{}%
}