If you want to make a map with no option to buy weapons you are in the good place.

I use both methods, just to be sure.

Method 1
1. Make two very small blocks somewhere on the map, and make sure no one can touch that, use aaatrigger texture.


2. Select one with Selection Tool and press CTRL + T, select func_buyzone and choose a team, for the first block i choose Terrorist and for the second block Counter-Terrorist.


Now these blocks is the buyzones for each team, but no one can touch this, so... no buy zones in the map.

Method 2
1. Go to entity tool and somewhere in the map the entity: info_map_parameters


2. Go to properties of the entity (right click on it -> properties). And on Weapon Buying, select: Neither CT's nor T's can buy guns


That's all for this tutorial, very easy but very useful.