IK Multimedia's massive sampler and sample library is only $10!
Unlike some of the smaller developers, IK doesn't fuck around with sales every 2 weeks. This is only the second sale for SampleTank ever.
I haven't played with this, but I have heard two important facts about it from readers. It is big, and will take about about a Gig of storage when fully installed. Also, the samples are seriously top notch. You can hear that for yourself in any of the many great videos from efectism.
In this video efectism is using SampleTank on an iPhone with a seperate instance of SampleTank on an iPad, being controlled by ThumbJam.