Consumers are finding some iPad models difficult to get their hands on, as resellers have begun showing depleted stock ahead of a late March press event at which Apple is widely expected to debut the iPad Air 2's successor.

As indicated in AppleInsider's own price guides, numerous iPad models are on backorder or simply sold out. The iPad Air and Air 2 — the two devices most likely to be supplanted — are experiencing the most serious stock outs.

Also affected are older iPad mini versions. While the iPad mini 4 is still in abundant supply, the mini 2 is harder to find.

The supply constraints don't appear to affect Apple's own retail channels, as the majority if iPad models are currently listed as "In Stock" through the company's online store.