System I use:
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onActivate Self VCE_ifValue 0 <var:client:50forget> 0 1 1 9
onVariableTrue Player addItem 0 1275
onVariableTrue Client playSound 0 1922
onVariableTrue Client CenterPrint 0 <font:impact:5><shadow:3:3><shadowcolor:000000><color:F0F0F0>Equipped <color:FFFF00>.50 FALCON 3
onVariableTrue Client CenterPrint 25 <font:impact:10><shadow:3:3><shadowcolor:000000><color:F0F0F0>Equipped <color:FFFF00>.50 FALCON 3
onVariableTrue Client CenterPrint 50 <font:impact:15><shadow:3:3><shadowcolor:000000><color:F0F0F0>Equipped <color:FFFF00>.50 FALCON 3
onVariableTrue Client CenterPrint 100 <font:impact:20><shadow:3:3><shadowcolor:000000><color:F0F0F0>Equipped <color:FFFF00>.50 FALCON 3
onVariableTrue Client CenterPrint 125 <font:impact:25><shadow:3:3><shadowcolor:000000><color:F0F0F0>Equipped <color:FFFF00>.50 FALCON 3
onVariableTrue Client CenterPrint 150 <font:impact:30><shadow:3:3><shadowcolor:000000><color:F0F0F0>Equipped <color:FFFF00>.50 FALCON 3
onVariableFalse Self VCE_ifValue 0 <var:client:score> 4 4000 10 21
onVariableFalse Client playSound 0 1909
onVariableFalse Client CenterPrint 0 <color:FFFFFF><font:impact:20>You can't afford that! 3
onVariableTrue Player addItem 0 1275
onVariableTrue Client playSound 0 1929
onVariableTrue Client CenterPrint 0 <font:impact:5><shadow:3:3><shadowcolor:000000><color:F0F0F0>Purchased <color:FFFF00>.50 FALCON<color:F0F0F0> for <color:00DD00>$4000 3
onVariableTrue Client CenterPrint 25 <font:impact:10><shadow:3:3><shadowcolor:000000><color:F0F0F0>Purchased <color:FFFF00>.50 FALCON<color:F0F0F0> for <color:00DD00>$4000 3
onVariableTrue Client CenterPrint 50 <font:impact:15><shadow:3:3><shadowcolor:000000><color:F0F0F0>Purchased <color:FFFF00>.50 FALCON<color:F0F0F0> for <color:00DD00>$4000 3
onVariableTrue Client CenterPrint 100 <font:impact:20><shadow:3:3><shadowcolor:000000><color:F0F0F0>Purchased <color:FFFF00>.50 FALCON<color:F0F0F0> for <color:00DD00>$4000 3
onVariableTrue Client CenterPrint 125 <font:impact:25><shadow:3:3><shadowcolor:000000><color:F0F0F0>Purchased <color:FFFF00>.50 FALCON<color:F0F0F0> for <color:00DD00>$4000 3
onVariableTrue Client CenterPrint 150 <font:impact:30><shadow:3:3><shadowcolor:000000><color:F0F0F0>Purchased <color:FFFF00>.50 FALCON<color:F0F0F0> for <color:00DD00>$4000 3
onVariableTrue Client IncScore 0 -4000
onVariableTrue Client VCE_modVariable 0 50forget 0 1