Some more useless information.
I wanted to find interesting price comparisons between here and home - so I've been looking for what you can get for $20 (still £10 - just). Not too impressive, so far, but I'm still looking!
1 Half a tank of gas for PT
2 Eighteen huge uncooked jumbo shrimps
3 Guacamole and chips and a Margarita at Sidewalk cafe
4 A memory card for a camera (1 gb)