I'm thinking of buying this for my slot machine:
http://www.shutterstock.com/pic-73574407/stock-vector-glossy-fruit-set.html
You think it is worth $19?

Well it depends... here are some things to consider:

• Will it save you $19 worth of time if you buy it? (US minimum wage is $7.25/hr, so little less than three hours worth by that criteria)
  
• Will it fit into the style of your game, particularly the other slot machine things?
  
• Do you have the right software to process it? (I assume GIMP would work, though)
  
• Could you find something similar cheaper?
  
  I would say that price sounds steep to me, but you might have a hard time finding free images without running into licensing problems (assuming this is a for-profit game), so it might be worth it to save the hassle. I would google around a little bit first, though.