@chads gives excellent advice. There are almost always some off-market deals to be found if you are persistent. Park prices have gone up quite a bit in my area over the past 12 months, but even at the higher levels, with bank financing at 5% or so, they still can make sense as purchases.
And yes, if we have a market crash and the banks start losing money on defaults, their lending will dry up quickly. Ironically, when banks aren't lending on deals, that's often when the risk (and prices) are lowest, and when banks are bidding each other to win business, that's when the risk is the highest (as are the prices).
Every market is different, but if you find a deal that makes sense based on sales price, current (and future) cash flow, and cost of borrowed funds, then do the deal now.