i know its not a RC shop...but they have screws for RC use... 
Example of What i bought ..$2 only..
M3 x 20 - - > 6 pcs
M3 x 15 - - > 4 pcs
M3 x 25 - - > 6 pcs
M3 Nylon Nut - > 12 pcs
All Stainless steel
The screws and nuts i bought

Example of What i bought ..$2 only..
M3 x 20 - - > 6 pcs
M3 x 15 - - > 4 pcs
M3 x 25 - - > 6 pcs
M3 Nylon Nut - > 12 pcs
All Stainless steel
The screws and nuts i bought
Comment