Financing availability for low priced houses?

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So i have my cash lined up to buy a flip soon, so I'm starting to look into leads.  I'm leaning towards houses that after rehab would sell in the $50-70k range, but do you more experienced investors find that it's difficult to find buyers who would be looking in such a low price range to be able to qualify for financing?  Or is that range house more suitable for a rental property instead? My strategy is to flip A couple of lower prices houses to build up more cash to invest in rental but I'm just concerned about the ability of buyers to get financing in that range. Thoughts.