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Additional info: For weapon donations to count, the player you donate to must not be able to afford the weapon you donate.

Boosting method.
This method will start a game and give you 16000 dollars. Then spawn a large group friendly of bots with 800 dollars each. Drop a weapon to every bot within reach, and restart the process as many times as needed.

You need the console for this (add "-console" to the game's Startup Options in Steam).

Save the following two configuration files to your CFG directory (\Steam\steamapps\common\Counter-Strike Source\cstrike\cfg):

(boost1.cfg)
mp_freezetime 30
mp_limitteams 0
mp_autoteambalance 0
bot_kick
mp_startmoney 16000
mp_restartgame 1

(boost2.cfg)
mp_startmoney 800
bot_add_ct
bot_add_ct
bot_add_ct
bot_add_ct
bot_add_ct
bot_add_ct
bot_add_ct
bot_add_ct
bot_add_ct
bot_add_ct
bot_add_ct
bot_add_ct
bot_add_ct
bot_add_ct
bot_add_ct

Open the game, and bind two unused buttons to execute the two scripts. For example, to use "p" for the first script, and "l" for the second, enter into the console:
bind p "exec boost1.cfg"
bind l "exec boost2.cfg"

Create a server, without bots. Join Team CT. Hit the button you assigned boost1.cfg to.
This should restart the game and spawn you with 16000 money. Then hit the second button to execute boost2.cfg. The bots should spawn next to you, go ahead and buy some weapons for them.

When you have donated to everyone within reach, restart by running boost1.cfg again. Repeat as necessary :)