Are you a content creator in SL? Do you use a vendor system? Which one and why? I'm working on starting a little store of my own and most people seem to use Caspervend but I also see it crapping out at events and high lag areas all the time so I'm a little leery. 
Caspervend... it only has issues in high lag areas if the user doesn't set up the event low-lag version. I've been using CV at things like Skin Fair, Uber, and Salem with no problems as long as I use the event version.
AlaskaMetro: Oooh I didn't know there was an event version! That's pretty cool!
caspervend. it works great and does everything I need it to do. when SL borks, like it often does, it still saves transactions and continues delivering when SL unborks. I can make beautiful vendors with it. group discounts, customer rewards, redeliveries, gift options, all that stuff works without much effort.
there's event scripts for low lag at busy sims. there's gacha scripts, lucky chairs, midnight madness, building rezzers, lots of optional extras