As others have mentioned in the above posts, you will have some limited options at the $300k range if you are buying a home at today's interest rates. 

With the landscape of today's interest rates how would you go about marketing a property for sale that has an assumable loans?

My cash flow is not great because of high insurance rates and HOA fees.

Get a 6% cap rate is the market now unless you get in the rougher areas when it might go up a percent or so.

The local vacancy rate almost 0%, a great need for rentals.

I had owner finance $3,000,000 dollars, 4% interest rate, 10 year term.

And what rates are people paying? 

My interest rate was just over 3 percent. 

After sitting on the sidelines trying to get into real estate investing for several years, I have the opportunity to purchase a 1 bed, 1.5 bath home in a desirable part of the California desert.The purchase price is $299,000 with a 7.3% interest rate and 3% down.

Moreover, new built homes are underpriced with so many incentives like rate buydowns, flex cash and cash off the purchase price.