Look there is a total of 3 categories to choose from:
1. Default newbie : Free
2. Supporter : 5$
3. Ultimate : OG 30$(Currently 15$)
The first one allows free users such as yourself to download plugins from anywhere other than the "Supporter Assets & Plugins" and "Ultimate Assets & Plugins" which are only given to the mentioned ranks.
Other then that you can download any plugin given from here: click me
ALSO: You can buy the ranks from here: click me