The prices in the market are similar, because the price of each family is open and follows the rules of the market. You can search on Google yourself. However, each activity is different. Some websites may sell FFXIV Gil with certain preferential activities in order to expand the market or give back to new and old customers.
I don't know much about other websites, because it's basically difficult to see price cuts, but the mmoah website, because it is an old store that has been in business for many years, I also visit frequently. Their belongings have always been following the market, but they have been doing a long time on FFXIV Gil, and I was still buying it last week. Buy now and enjoy 5% Bonus. It can be said that it is very patient to treat each customer.