Hi Garfieldgirl,
The most important first step you can take when you are mattress shopping is researching the better outlets in your area instead of researching which mattress may be best for you. These tend to be local factory direct manufacturers and better sleep shops that carry local or smaller independent brands. When you have found these … you will also have sources of reliable information about the materials in your mattress (instead of marketing jargon) and better quality and value mattresses to choose from. They also tend to be much better at fitting a mattress to your long term needs and preferences rather than “selling” you what they can based on various marketing techniques and the highly managed environment of a showroom for the sake of profit margins or commissions. This article will help you avoid most of the worst choices.
Post #2 here (and the 5 steps at the end of it) may help.
I personally would tend to avoid air mattresses. This article will explain why I believe there are much better alternative mattress support layers that perform much better and have better value.
The iComfort line, like other mattresses made by major brands, are a poor value choice compared to many other options that are available to you. Post #11 here has more comments about many of the models in the lineup.
Costco have some “throwaway beds” and from time to time also have some higher quality/value mattresses but as in any mattress purchase the only way to know the quality and value of a mattress is to know the quality of the materials in it. It is also difficult to know how any particular mattress will work for you without the help of someone with the knowledge and experience to help you make good online choices but at least they have a good refund policy if a “roll of the dice” turns out not so well.
Because the iComforts are so low on the value scale … almost anything similar made by a smaller local or regional manufacturer would have better value but of course they still need to work for your needs and preferences no matter what the quality or value of a mattress.
Some of the better choices in the San Diego area are in post #2 here.
Hope this helps
Phoenix