Couple of things that need to be scanned for prior to purchasing in any Condo development.
1) If you're buying Non-Owner, an HOA Cert has a 99.5 percent chance of be required by your lender. FYI It's sometimes case by case when buying Owner Occupied. The HOA Cert will turn up details like litigation or low Fidelity Bond/HOA insurance, killing off the deal.
2) If it's cheap and a great rental, you may not be the only one recognizing this fact. Some Condo projects are well over 50% investor owned. Once that tipping point is reached, only a small percentage of lenders will fund in that community and the rate you may get isn't bueno. The only way to get this information is from the HOA Management, not the seller, and not the listing Agent.
One way to tell if there's an issue - check the listing history on the unit in question, as well as a couple others in the same tract. If it shows Listed, Under Contract, Re-Listed, Price Reduced, Under Contract, Price Reduced, Price Reduced... it means there's trouble financing the property.
Some listing Agents will tell buyers "It's no problem....you should be able to finance the home!" - I had this happen last week with a customer of mine - The seller and their Agent had a nice squishy letter from the attorney suing the builder saying it's nooooo problem to purchase. Oddly enough, the seller or the Agent didn't have a lender on hand ready to finance the property for this buyer. As it turned out, The project was for all intents and purposes a failed remodel and likely headed for years of contingency fee payments to these attorneys. Best not to get involved in cases like this.
Low cost condos in well managed communities is still a great way to invest in rental property. It's the up front legwork that will be a bit of a hassle, but well worth it in the long run.
My .02c