There are many condos/townhouses in the Myrtle Beach area. All have different HOA's. What you need to look at is what is included in the HOA fee. i.e. insurance, amenity center, grounds, what are their rules.
For example, I live at Island Green Country Club. It is located inland, but within 5 minutes to the beach and 10 minutes to Market Commons (shopping). I pay aprox $200 per month, includes grounds maintenance, cable, condo insurance an outside pool in each area and a wonderful amenity center which includes indoor pool, sauna, hot tub, and a gym. We also have a mail center where packages are delivered. This is just one example, but something to work off of.
Let me know if you need assistance. I would be happy to add you to our active MLS search engine and answer any questions you may have on properties you may be interested in.
My phone is 860-262-1203 or email firstname.lastname@example.org. Be happy to assist.