I live in St. Pete, FL and I want to sell my house using flat fee MLS. Should I order a CMA (Comparable Market Analysis)?

Value is very important. In St. Pete, the market conditions are changing rapidly and pricing the home right is critical to your success. Price too low and you are potentially giving away hard earned equity. Too high and no one will call. So the answer is, maybe. It depends on your ability to do research. A Realtor® is going to pull data from the MLS “sold properties” within (x) miles of your property within the last 6 months. But, as you know, the market is changing so rapidly that 4 month old sale data maybe misleading. As well, one or two “sales” within that data might be “fire” type sales which will skew values but are not necessarily indicative of the right value. The best CMA is to look at home listed on the market (Realtor.com) etc; research sold data through the “on-line” public records; talk with neighbors and a Realtor® attempting to break all the data into a “price per square foot” number (living area). Then add or subtract value for conditions such as: (i) lot; (ii) pool: (iii) upgrades; (iv) other considerations.
You may also want to consider ordering a CMA through ADDvantage for $50 in the Add Accessories section of MY ACCOUNT.