Adobe has changed their pricing model from a single-purchase model to a subscription service where you pay a monthly fee to continue using their products. This might sound cheaper than a single-purchase model at first, but as you continue to use their products, it will cost a lot more in the long run.
If this does not sound ideal to you, then consider checking the alternatives below. The list includes free and open source products, products that are free of charge, and products that only require a one-time purchase. The poster below was made by graphic design student xdanielArt (his twitter).