Apple just started a new trade-in program which will let iPad owners trade in their older tablet models, and get credit towards a new iOS device. This offer will actually apply to the iPad 2, iPad 3, iPad 4 and first-gen iPad mini. Each of these can be traded in for an iPad Air or iPad Air mini or some other newer iPad device.
Here's a quote with a few more details,
Sound off if you live in one of the countries which can take advantage of this offer.