Hi leol,
The optional online step in the tutorial includes this link to a list of the members here that sell mattresses online that I believe all compete well with the best in the industry in terms of their quality, value, service, and transparency. They include many different types of mattresses and many of them make latex and latex hybrid mattresses that use different types and blends of latex (including 100% natural Dunlop mattresses) that have a range of different designs, options, features, return and exchange policies, and prices that that would all be well worth considering.
Many of them are also component latex mattresses that allow you to customize the firmness or support of the mattress after a purchase by rearranging or exchanging individual layers so a return would be much less likely and many of them also have good return/refund options as well although there is normally a relatively small cost involved. Don’t forget that any return and exchange policies are built into the cost of a mattress and the large majority of people who don’t return a mattress are the ones who pay for the small minority that do. I don’t know all the details of each of the return policies off the top of my head but they are listed on their websites.
Two of the most important links in the tutorial that I would also make sure you’ve read are post #2 here which has more about the different ways to choose a suitable mattress (either locally or online) that is the best “match” for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for and post #13 here which has more about the most important parts of the “value” of a mattress purchase which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability, durability, and value.
Phoenix