cage?

So this is the cage I want to use,for sue I'm getting mesh for it,but does anyone know where to get a roll thats not to expensive?/i checked home depot and several other site.I did find one reason able price though.the dimentions are 3 feet tall and 22"x22"

I use a cage very similar to that for Lily to sunbathe in outside. She moves around the sides ok - I haven't added any mesh to it, but it is only a 'few hours a day' cage. I also use it indoors when I need to clean her normal cage, or to put her near the window when the sun shines through in the winter.

I'm thinking of making a cage for my veiled. I bought her about a week ago at a reptile expo from a reliable vendor. She is 3 1/2" to 4" from tip of mouth to base of tail. How big should the enclosure be? She's in a 12"x12"x18" glass enclosure, and want to make it with fiberglass mesh/screen. Any +/- with the fiberglass? Comments and help are much appreciated.