Hi Lynne,
Post #2 here includes the better options and possibilities within reasonable driving distance around the York / Harrisburg, PA that I’m aware of.
Post #1 here has all the information steps and guidelines you will need to make the best possible choices. It will give you a step by step process that will help you know “how” to make good choices and what to look for (and what to avoid) rather than having anyone else tell you specifically “what” to buy … which is not really possible for anyone to do for someone else.
Yes … the Serta Stabl Base foundation will likely be fine but you should always check with the manufacturer of any mattress you purchase to make sure that the foundation you have is acceptable and satisfies their warranty. A wire grid foundation has good ventilation.
Phoenix