There are these elsewhere. Use essentials, I believe you can set a price for them. If not, just do a room for each kit 1 item per sign
My spawn is very small with portals to different activities, and the edge is a large red border where if they cross, pvp is enabled. The idea is to have signs along the border with different loadouts they can buy by quickly right clicking the sign. That's why just doing an entire room for a little loadout is a little ridiculous.
Then just place the signs along the edge? This would make sense, and its not difficult. A plugin is not necessary for this, when you are just not willing to put the effort in to place them around the spawn. Essentials does this.
Just use essentials plugin. Make [kit] sign- look at kit tutorial for that and get that setup. If you need help, I am sure I could help you.